{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618741377",
    "entityType": "Track",
    "nonce": "0x733649ac011b9cd0ccabf0d51388e86ef867d0284c69e6a29be5e3fd70c351bd",
    "signature": "0x84c34d63d502ded832d41adfc0949f8ca4cbdc6f1e6d1cf94ad324ac0a9e9cf752e99d50eb3783aaa0c2d5f76660e4541def5b2f593e3ddf7f5f41a93453084d1c",
    "signer": "0xC56E1ccbA93c1E645e5F27Bf8A5ca13eB7A5eEbe",
    "userId": "335878078"
  }
}