{
  "manageEntity": {
    "action": "Save",
    "entityId": "2139830898",
    "entityType": "Track",
    "nonce": "0x828b39daf6e1b8e166104fad3595bd592b063034e42b719b3c11eb9830fcbfb7",
    "signature": "0x74f8f676c96394eba0284650565b0964b2f2d2bde0350265721f46f68a5b0b35249609ec903c01a83dc3d2d31813250956b7cf5ad562e53c4912df5e7552c8fd1c",
    "signer": "0x87FC3581f96D45b347BB39E15f25079950C5Cc27",
    "userId": "339826419"
  }
}