{
  "manageEntity": {
    "action": "Save",
    "entityId": "954480",
    "entityType": "Track",
    "nonce": "0x6c9dcb31754bbe9015f9efde19ea2adaa4447493abaf38850f4476976a51370d",
    "signature": "0x2e79c6ec50f18197a1f64705bfc5224fb4d45f3d733e9702cfbde4b30251a0357026af35eb4a80d2cc78afb33e065cbd28c16a622ba323c0139032e67072ccc31b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}