{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904517418",
    "entityType": "Track",
    "nonce": "0x18c33aa6965545c67a60e607b4a27c23e37c0016fa0f199dadf6158270fe3c2a",
    "signature": "0x5f8a341796057b536f7a55c610b0763f1a511024145cbbc96b1cbc9c64a1e77945e9db84f07e775dc54bbb1422cd0a9c72986a487713373ff233271e4800d2eb1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}