{
  "manageEntity": {
    "action": "Save",
    "entityId": "1258421284",
    "entityType": "Track",
    "nonce": "0x82639d2e96078e5367acc78fe6b174066df8da3eca1782495ce4a273ccd66586",
    "signature": "0xf05d9353bc13f5e3d89eb48428f9bb4410e367d02a749b7629aaa1ee8b42c86e45d1d0e4928a2167e51d7c44ab2413d59556de463f4ace5b75aa033a596e3e411c",
    "signer": "0x591E8b46f0D8b7a1FeD63222b6e5E3EaBe2900F6",
    "userId": "877370116"
  }
}