{
  "manageEntity": {
    "action": "Save",
    "entityId": "1450553762",
    "entityType": "Track",
    "nonce": "0x5d418e90574a0b27051c0d839c342a8a06ecbef92eb3459da6e06aa9ea4558a6",
    "signature": "0xaa5e639c28be89baa8d898aec508dbbf962aa8eb210f41822f451620ed709bcd6dac2374ccbe976b324c8791cfcd1156aaa40dd12a1064a41057166cd51b0df51b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}