{
  "manageEntity": {
    "action": "Save",
    "entityId": "252561",
    "entityType": "Track",
    "nonce": "0x441479abbc0fd34a2c24acd647e4f5b22b8f2e7a76f0f18bfc26a24800dede60",
    "signature": "0x0c28eefcb115dcbd1ff58cb02db1d78c9a5c9663d17c92bb091552602db8f5f758a8b911c6a656064e0f694ee96d364ef4a2759e7e6595b05cb8be9fe282aea91b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}