{
  "manageEntity": {
    "action": "Save",
    "entityId": "158813",
    "entityType": "Track",
    "nonce": "0x5f633f85651b7d8dfa1ff075cfbc4ad9b06a6830b09f09a2e862f9e59017684a",
    "signature": "0xa90698a5213e92a47038069783981d8cf01f723f27557ce83f91c16f6bef0046618a29791c65143a9e3a48cf436d7e837d966e1724e3a7a9ab8b87df02d3a8101c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}