{
  "manageEntity": {
    "action": "Save",
    "entityId": "1147484747",
    "entityType": "Track",
    "nonce": "0xeebcd198539a2748374836622bd034a2a8026cc8c8e055e18e08cdd271b27c93",
    "signature": "0xa6e0b0bc37d45b8de10d578416d2aab85c2f652c67d2a8d2d9f84aae344f278e04becbd512e4fcfeb9083f49cca53269199806f8b0f71926d275142c120a6b301b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}