{
  "manageEntity": {
    "action": "Save",
    "entityId": "1203315372",
    "entityType": "Track",
    "nonce": "0x43583bd49a86634de084f25b25314129ae8063a37c4eb1ccbd46c2bde0d4f3f3",
    "signature": "0x89e51d68b1fa85e0b7593792fc3d845d83a09efd4fddc25f6bcee511baa0aa2565feba76ae025691953413247c797e8d6408be07a62511ca9ec6ea14b07036d31b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}