{
  "manageEntity": {
    "action": "Save",
    "entityId": "454839768",
    "entityType": "Track",
    "nonce": "0x4b1d50d2e537e7e4b0af11b1c951e7f41f9836113ef86cb6e69e9dfae0ca0156",
    "signature": "0x5eaed40a0d74851dc9c4728c37e7d3ef6a47c8087bd49fcce9c1ceee122c730a33c0d7c046ac21241ca01532de799bb8c6ac6d8511e684fcd421f0930f2f0bf71b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}