{
  "manageEntity": {
    "action": "Save",
    "entityId": "601984933",
    "entityType": "Track",
    "nonce": "0x74ed11e71895960dd7a1934d1cee0281ff21cdca2cae69824293ad00a815864d",
    "signature": "0xe7355569fb0e86c65e123b4efe94f3d0e3acee864bdfdd47ff2568c53a240d2d65dcde0f67f6a4d6b918e7b3a0ce524f0a9a724f26abe31bc1d6d63ca102b61f1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}