{
  "manageEntity": {
    "action": "Save",
    "entityId": "761829063",
    "entityType": "Track",
    "nonce": "0x13a0acd6aa8d538ea98a0f9d1cc4a82a73086561332664e1ef660f552121009a",
    "signature": "0xe3c8735461270adc3bbea187a5dff196a168a1a9af0f7744acb11e4b8a71feed006dd3c1d1501e52d99c36cc1d8920b574dadf3500c5610e2b194643cc9e3d6b1c",
    "signer": "0x866CB73184a8420C302e3850B610761F882C4DDE",
    "userId": "166428182"
  }
}