{
  "manageEntity": {
    "action": "Save",
    "entityId": "1912713038",
    "entityType": "Track",
    "nonce": "0xa4300d01dbee6bf5449c5ac41df86114564353ec805b2c74ce33065bd97955e3",
    "signature": "0x75cdc993c1b44d8ce5d4790390d72580aaceb7cfd86320e4eeed253ed39cc0fa0f0943a5314bdb359a8c68092a678d46bdfec6315beb1b087a0cb90b77be0e541c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}