{
  "manageEntity": {
    "action": "Save",
    "entityId": "696870",
    "entityType": "Track",
    "nonce": "0xa450505efcc0c4faa3ca0e373d46f406b51947226071161fc41ca6ffd5bc19cf",
    "signature": "0x938684322271bf4b5fb96f69aec92af734db46805011964b8c14825dec57e0af460431d6f854aaf8c84722071fa9fae490fdd7e1d416d2559492c6cf0c69c7731c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}