{
  "manageEntity": {
    "action": "Save",
    "entityId": "354546637",
    "entityType": "Track",
    "nonce": "0x616fcdf9e5a0856b28c042463453ad48f93e1879222afdac7a5c103127bb1e38",
    "signature": "0xa479117c88eb631357ba5e230b4694e6b5210215402d04ad8be5d4961067f5471496d1dee9e2a60215e27f3d1ea0472e80344a8805f6e02aaa95a0929e2edc751c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}