{
  "manageEntity": {
    "action": "Save",
    "entityId": "878158510",
    "entityType": "Track",
    "nonce": "0x290837372272c86eeafad9bd9c4f74622be8093cc89e7aa4ec48f30c1e41edf1",
    "signature": "0x704298e3d4058cf2984220c46d8e33d876466844f1bf1024f59a6b5bbac750644f5421a85196473136c39f3db71ffdcda2829fcfac1b905040073fe552946cbd1b",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}