{
  "manageEntity": {
    "action": "Save",
    "entityId": "564430",
    "entityType": "Track",
    "nonce": "0x5b18bcbe72b09276da48a25d32d80f5e6c83d60ca739da78619b3f630cadc673",
    "signature": "0x36411e03ac9bbb551e14e81bd7fd1b6419f1dc1acc1ee12671058a1888cf78bd09d83bdb6582300d0d87126396ddeb01e1fb99f5cfb504e958eba31ac2f9bd151c",
    "signer": "0xE22639FD840080b20889373FEa6060B4757eB9c1",
    "userId": "274627911"
  }
}