{
  "manageEntity": {
    "action": "Save",
    "entityId": "521662831",
    "entityType": "Track",
    "nonce": "0xc4ce331249876d628e13752c3dfed43ccae18e953739a643e9b5df80ee06e615",
    "signature": "0x5608d7cc166aa7ed0f64f222d73d9d86748cb0fca4217611b911b9ddfcf64f66178847ccc6d9d9a81916424dbad45387371dfa0d16b0c0172e48fdee046c22711c",
    "signer": "0x8f0A5939761dE5f6b984a401d42E21b5B3023674",
    "userId": "925049268"
  }
}