{
  "manageEntity": {
    "action": "Save",
    "entityId": "556210696",
    "entityType": "Track",
    "nonce": "0x3f56fd84abe9d1bca07a50ad270c99ecd6bc55ab2f9baa24ec1778150ce3752a",
    "signature": "0xbc959d72288c9fd16fd2d679b4daa3d7ebbfa1ee88778c4179518398feddb5d331609b4c2de3f7cb0703f14cea83262b2caf27dcfa94e5d88a440f560f96af1f1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}