{
  "manageEntity": {
    "action": "Save",
    "entityId": "187380573",
    "entityType": "Track",
    "nonce": "0xe2580d89b9f5ef2c4f7ada8c6cca99d5a21051054e75d025051762fc41cfcb3d",
    "signature": "0x907e05affad2c8187e207dcc9e831eb615d3fa4f5f38e18b57059771eb5178ad120c323d935e0c47895c1210e02c5e8bc65b5c711deed4bde13372de4f5b443f1c",
    "signer": "0x34Cea527C1dc0575a5B686515aad0Bf8F3b5f97E",
    "userId": "13589021"
  }
}