{
  "manageEntity": {
    "action": "Save",
    "entityId": "517836083",
    "entityType": "Track",
    "nonce": "0x431ff0f6d3e61a971816ca9f48ecab6246088b2c8d0a936740c328695a79b318",
    "signature": "0x490a148994686a39df784a9673c2ba89ddfb5d374350fd17ab85b020d975a2f53a64c4b1cbb8a958bd1475b66f4bba7545bfc39698d6922870c3b865d4011c9c1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}