{
  "manageEntity": {
    "action": "Save",
    "entityId": "903318934",
    "entityType": "Track",
    "nonce": "0xceee647bad58b54bdfd4758bded4496873b4cacea5a81860154c9c241cc216af",
    "signature": "0x1a34929992b574758f017449e8587f119ad57eedb6ec2bc96b78005e9517e95d6d994088bf80b8d2bb030f98ebdc1ca8f639b5da25bd4e8c798dfb6a0d8d4d311b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}