{
  "manageEntity": {
    "action": "Save",
    "entityId": "907444352",
    "entityType": "Track",
    "nonce": "0x798191503b1d92b02f7d6d63abe2c27d4da3b709f3a1e2731b86af5d57efe76c",
    "signature": "0x1a1ffe4c3eac1f8b2a96293b2299b3a33ffa21e2b2243f1cd40f2983b019d38726ecd7558ea60d46151d042cb26e639e4b784f2041dead506aa8f635bb3773e91c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}