{
  "manageEntity": {
    "action": "Save",
    "entityId": "562856502",
    "entityType": "Track",
    "nonce": "0x154ea2dd550e4a55fbb4709f6b20569e10a0f9087728c6c6f8393d01569f2970",
    "signature": "0x08aaa9951301018b0cf83039aa97ae82ace115fc22ceb6f9094cd068a68c13a5218667aea513b436f50e4030445db5d93e19252897b25645445f97635a41cc4b1c",
    "signer": "0x71B8B1Ada9007B065F72f30543e6E310d061605D",
    "userId": "63219485"
  }
}