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 0x629af95210ab8404fce424137be2d7603040989ca4bf4f45a4c312c3ef95b4dd. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dabb8a4-26c6-4dc5-ac34-a3b5253dbd66.json and https://artists.proofprofile.net/proofs/artist/2dabb8a4-26c6-4dc5-ac34-a3b5253dbd66.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 0x31c1eadf65c7de6b22e064b38906aa863f59dc40c077aac7e9dd32fc1f68b798. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BCGTP2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b44c4442eb42f9da7f962f172f2315102518ab73e6900faae1971a637309b9b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BCGTP2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa168312dea88adc20b0693a20d530ca2ccfd506eed679ea64c64252c36985e33. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG2454554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c070d499b756a82493c65c4f9552bf9796127fcac18782bdc6b7765da67ffd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BX3LP1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d68b39ac159166f5a1fe6f6d2fb1a7bd26adc047ea9a22729c348311551448. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BX3LP1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc55e5ea0d78e3667cde6d5aeae793492a18280a9ec6852fec63c24a6bd424a8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BXF9K2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae59ef94c4a1da7b8e05cbc534416baef646747bece2bd199cfd27e436495259. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXYXR2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947c1dcd5b53669863734442621eabc03964f250c022ebeb3401f78330975f7b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BRTRB2090976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ad0cf8080ce3ba065b9b39da5ceb816e71df038f05782270e6f283b15d1aa7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BCS312400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815327c1ff5158a121e715aea0c1b243244158f19e74d8f6c1d828648123cb73. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BCS312400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bde07e819e12ff1954dfc21d18e81b9308dc3dc995606ce29a1a22ed682fbe. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BCS312400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3348811812a072f6849682ee841bba3fc475b36ceae8d6788a463183a53e2c4. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BCS312400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a2b691e5cc1d0fe4ccecd75e74e754b955b02bdd92a8630621834502df3546. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BCS312400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e12dcb62c80e6535d2ff0d519b1e6dc199f3617e03128eafc59890e800f776a. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/BRVYH2100003.