{
  "manageEntity": {
    "action": "Save",
    "entityId": "505756896",
    "entityType": "Track",
    "nonce": "0xd1ae4ea89c6755365a10f6b7aa5de6507955470469740f48468cfb824e9c7d1c",
    "signature": "0x0dc05f8b00d0750703df4f5bcf5f63d11f60c5b1859a19918fc783366689148020e704a612df4fe0437f3de63afa44ae33be3c4d9ec52b60fdf760feb55981731c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}