{
  "manageEntity": {
    "action": "Save",
    "entityId": "1447242145",
    "entityType": "Track",
    "nonce": "0xe830e825f40445fb50f50d479fbc4e82bd08219bef9813b0ed234a403adbc6a0",
    "signature": "0x82b0605f045d6b52a689afd341c9e7492a8a7c7d7f13b8981b43a8d46391f0cd4ab01d265fa11ace53f49645b29f394b607ae000c8f621c00663275e494d58a91b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}