{
  "manageEntity": {
    "action": "Save",
    "entityId": "1312983318",
    "entityType": "Track",
    "nonce": "0x88f393d6e323056a857a3921174b286adbd473d66b1f18d64affb04201d9ae11",
    "signature": "0x7d86b86fb48bb1a3a7456cc8900ad5a34029efc6c1b5b674604737619e23195a17fea1bb571cd8b8a9871a64b006fc093280869bb6ea9796974844e928416c811b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}