{
  "manageEntity": {
    "action": "Save",
    "entityId": "616747931",
    "entityType": "Track",
    "nonce": "0x1d474160fff46e97e12c67872e5bc12e53f715c288e9902ac361d24b12d86427",
    "signature": "0x825d7a7bf6492921ddc2cee0bc0cb0586d44f57cb5d7f0a9f9ca52972db98b2f2007c64799ecf6064c00eb43fdb549717ee9a7a5ffa2d645041ea1fd6b21781d1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}