{
  "manageEntity": {
    "action": "Save",
    "entityId": "1566008306",
    "entityType": "Track",
    "nonce": "0x04a3f37327315d0ab3f5f0fe420998eee55d01d0417f3de354114f9a174687bc",
    "signature": "0xc244993335a259063fa123457e01a20998e66230ed538ba830a6e821493c81e45a0ddb2d7e0286fdb2e2fadcb1bee8ea161f22c12b768e8b0e3be43edf909c3b1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}