{
  "manageEntity": {
    "action": "Save",
    "entityId": "1429547614",
    "entityType": "Track",
    "nonce": "0x9772dc130e903c0378a3c897932e54f624e297ae3ba9c85969894c80040cc6bc",
    "signature": "0x43a0337d81fe562047e02f4e8facb679318368f553944d7fefda8988a688b4f239bac0f02b1918915158191ee7e720eb35c4640cb51f7ca0041733121aac00fa1c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}