{
  "manageEntity": {
    "action": "Save",
    "entityId": "698149396",
    "entityType": "Track",
    "nonce": "0x2bf7b97a62cafcad53ef4b2eeaf604718b670ce72a31da62b4b49eb4c18efc55",
    "signature": "0xf0fccac5d059ebf9529b09bf6d5e5cf6bd6524d713940c4965b2133395c6a7172b5f89964856cc38e50fcaee538e75f2d0ae1c321cbb8a7d50abaae9f1b622641c",
    "signer": "0xb9e0D02287650FcEA035b0dd821Ae8298C38E94a",
    "userId": "121729936"
  }
}