KDC may refer to: Kurt Donald Cobain (1967-1994), American songwriter Korean decimal classification, a system of library classification Key distribution center, part of a cryptosystem Kandi Airpo
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91107a4a954b62d6ac0c68b3342fd474c75c0e4eb8b46a79eaddb0b9ff8a6b97. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53ddbf83-b44c-4d5f-b05c-a77d43924b38.json and https://artists.proofprofile.net/proofs/artist/53ddbf83-b44c-4d5f-b05c-a77d43924b38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b64626ad2c9302c211ee3c00ef7843cf15e3d14a87283e7b8193a50ee08004. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7VG2334127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fc14b3797961fe59826d65ec66393d3219a707e81764460a605bda3160d375. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNW72382086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3da4db385e04cdb577e290236d0a657952c45baef0a60534cb9545c3aa1210. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZXLZ2306414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d35495333f70f2a7d60c833e3b1559578bd53ddb2a4ad0db181ba80ddbd6d4b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22385361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5545e1f6635989dd5cde119d9ae3010d6b8586efe3ed327af849e126f6b5e003. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNW72309608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e26b04700ebac4dc4c99aa9e69273b959434f05c0291304d91e667216309c28. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9M2298552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd451040b87cf08d11001df2a2cb40334f47e1ae49a8937402ce4428e82c6b18c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZXLZ2385889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b13b759063f3b017862d5affeec3ff195453326c248d0fd3916d4bfeea384b8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9L2298048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3da4db385e04cdb577e290236d0a657952c45baef0a60534cb9545c3aa1210. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZXLZ2306414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7ffa56b56c00a63585a18baf06e63a57f1c4442c796b8126fdbe51c2e21a78. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZXLZ2369409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceefdb06effec5ae44f7bba50ee78c793e52312e9d1bf4cc452d8c648a8246f5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTPX2274200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608c46785014e3970e303e92522692f229e2830aa7554022cceb4a010a4e0df6. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNW72361238.