{
  "manageEntity": {
    "action": "Save",
    "entityId": "1485653932",
    "entityType": "Track",
    "nonce": "0xd591c990cc1ef0fbcd54e5d0ebf917c259d4dbb7a285607542a3321a2bb4a3f9",
    "signature": "0x733418c405f550afe60879dfa5c73eb5d892d2d12687cc0573e54166c4e26bf2297e6a47296e45ea25607bd17c2191a878579b1e6723f56aebdec5afb852b7cc1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}