{
  "manageEntity": {
    "action": "Save",
    "entityId": "136514840",
    "entityType": "Track",
    "nonce": "0xb8c9b81a9932a8daa8004262fd07f0baa58a7cea5c09e7b66a1a79bb8edee602",
    "signature": "0xaa3bd2fc71a112364ec798cb1f6b8fb71282db8c23c3ee001650d67fe4c2f208087392bde2066a2e2337033bbf2d7ae9c2b4057722248a6931cadb733e3edb831c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}