{
  "manageEntity": {
    "action": "Save",
    "entityId": "391559159",
    "entityType": "Track",
    "nonce": "0xf8cf5a1dfd3594f9252489823fa47c6d16c939c4da7c08b4eb47815f537f186f",
    "signature": "0x7cc37654dde24d9547b8f7ed7443ae51e7e09732d982eff9da98c7a40048b0d12a240eeca158e24f2fd702258ca2abc9b7a0aa71894fa9a89dc260551876dc471c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}