{
  "manageEntity": {
    "action": "Save",
    "entityId": "534500750",
    "entityType": "Track",
    "nonce": "0x7c410a64491c3cb93b032ab12f21f4a15869dd17c97ec53c772d74b294c773c4",
    "signature": "0x1aea1a94dd68b335d25fc41ec5c3fd708ceef53195eec5bd9a4c52c75cb8724f4b84815f4516885f70c5374644b92c6bb07313c749650679efd19e27c50104291c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}