{
  "manageEntity": {
    "action": "Save",
    "entityId": "89700",
    "entityType": "Track",
    "nonce": "0x2658bbfd3a1071f95967e32406851d80addbe9c81cd898283d32979bba3b7c15",
    "signature": "0x640bf00ec167376224a1cd82a9c879de8a8b0ed25cf63d3f99b021dff4101f2c38c141a98793b04a72e45f56f6da35b0ca935ef3329c078964512e25ab513cae1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}