{
  "manageEntity": {
    "action": "Save",
    "entityId": "383490689",
    "entityType": "Track",
    "nonce": "0x8489e03cfbe0071349f383d239e59bc9f4ee4a1eb02b2ca6a309eeed9a06e374",
    "signature": "0x4c3102378218cd44be2a65577bd1be5a2962d7908e52240536ff646af8a1d62059598e5e47188af30feec322b49a51dcb4f4f2560c1e8bfeb5ad11c1353959fd1c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}