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 0xec9cd2013a29205f705a946c8e63829f226fb808dddcbb9f47c4dec001296df7. 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/d8f11f5a-7c14-4226-9888-376366be16c1.json and https://artists.proofprofile.net/proofs/artist/d8f11f5a-7c14-4226-9888-376366be16c1.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 0x688aa24076b5c1a3e0c54de60dfcbe855a2281df6b5a89d2e58c5a08d5c8ac9f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES81916349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a99eff7dde9485ac684ed9df7abcf16f8b7dac615b65ffa9865811ea741e06d. 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/QZES81916350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4413f40cb954fd076d0408c25eccec08377cc79d42efcb918c04b3ae2cdd5d00. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES81916351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bcdd1290a5642df7f96c856065bb9ad996b74a22165d76f0b336d6c7e4e7f8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES81916352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6193042871ceb43b7323020fea76f97c6ecebc3945f1b98ccda5b2babd9c6dac. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES81916353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9142b34079685060041ba0fcf66e10b255eb99a655db5199bc0df32c765e916. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES81916354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe796df90d09b1fe3fb71dbd86ff25a904edf4dbc9df4a0ad64ffed9812237234. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES81916355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3efd8b793160383833b87d7639943b77a0a125291c98f0b4501a59734b291b. 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/QZES81916357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5b0d07bc988c0bfac496ff38d4e91489a49438987fc2105536ba5d6cf8709e. 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/QZES81916358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eef91018f399a3966196aa307d6945703860c3a5455fbd7744026ba0252d6a4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRD0K2404550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab81b5de796f261f83ff0b2018c35f72ce8f4e036a267958ab0233da92a9a9f. 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/QZHN92445837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67602282a8fe250c1c25dee85e1c126d68bbcc4c53f3ea832afd5a896b01f905. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZES52438771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71b3ae9ee0acd921388cb88a8e4ff9a71edfcec837f68b07aeb81eb70b4f37c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN42072021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11e4cc1290ec247792a8a607dbdc6e163586e31f390f04683f2bd4915f50de5. 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/UKLVN1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f87dbddb29e71d8f2234a13a49a3f7d4627e15aac6d6921fe565aa485e53d9c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEYOK1724983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d03bd6ec2471bde213f85fe03545cad5510150846387339dc1bb8fb36e4c4b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEP2046622.