{
  "manageEntity": {
    "action": "Save",
    "entityId": "18141223",
    "entityType": "Track",
    "nonce": "0x56bf3ca9317c4f21d385605a31a671e6f5762e2c60ced08b54f37b5f98bc3a84",
    "signature": "0xe0269d882d66cc52a04aa46258d46715b323a7320f9e0a7e38ba65186eda3a3b387985042df2afc4d235ba192e365e0967348692c4820ceb34db4f82b05787c01b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}