{
  "manageEntity": {
    "action": "Save",
    "entityId": "882989293",
    "entityType": "Track",
    "nonce": "0xe0620134f187d4248b82ae4e55d3d54ecb639607e8ad5d93d615ab9a22eb2850",
    "signature": "0x2b1c7a1da10d51b20faa6ee75d74b0751e00efd52d6cf61caf8bb025b3a514dc2e8b046fa7c1ba045d6e395e1f04a1339e7a80ac86b75d7ddbe17a6dc84be14e1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}