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 0xfa864e3108524cc020e8bc01a4e530c91dcdca399a0b7b9328beda590a0add77. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab73a2c1-f218-4ca1-9f32-fe265c056208.json and https://artists.proofprofile.net/proofs/artist/ab73a2c1-f218-4ca1-9f32-fe265c056208.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 0x35d7883ae6e88bf97896d1ccc63e854ff5031e87ee74002aca5832306ff57cb0. 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/QZK6J2403238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af29da5f5c7a5a3be6888fd68d5455806e43962a306b009e2037d7447adad3e. 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/QZTB22334833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efdf327824914250b00c4ca9f963cb7ac67342c359e8fc6ca957c678c110793. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZHN42307812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681052508e2dd44b5aad668a7d4c77b879b28f554b16e5cb4e55774f190f1f46. 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/QZMEQ2296107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b9c76de22754076341bf599bb370be832510c818478d3b716c45cfe0d546e4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZMEQ2296108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e662d4787f852e0b93e80fde7bb366f51ab4f8358145ec5d328c533bcfbb87. 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/QZMEQ2296109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eff872845cca06496f772bd5e27f7c31b56ede4e570606ebfa41765d6ad59bb. 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/QZNWY2145465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab91d59bc1cab6028afd6ab099ac5bb2a315826796c8987a172814011131dfc2. 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/QZK6J2164281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b53cbf141213e246ebaa01434a0cf28f5e82886e2b6ed14a2e7d6172217d80. 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/QZK6L2043949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13d7a8271a14f2413b80a869ec65e0b6a06d6820754f5adfb73c362cf7b194a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6N2015306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee3ebd2aab78f2e3395330308a531a87322c69121c611d0e7c2a6b34a25a100. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN52037248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe544f191fdaaeee37cb2eba0b4fdf1fc35081b7ec0fd8dad47a2779a76034a3. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZFZ42001277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9407af0856d0c6aadb7e7e94dd42c8db1c0d8baa11202a9f9eac0a922e9be6bd. 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/QZK6N1958044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5071a39b98913f9a86855a015d812c9a67f5968ed40f8ac07c8e60b025f2b12. 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/QZHNB1938337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff019b0e1311136a48d7cc8a019a9f4fdc5b3496fbf50d6f1628cad784975ec. 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/QZFZ41951325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff97771dfb425f1608b20da84bfa6d4e3e985aa69e6a595554cb2e5b0febbe1. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZES61995597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f29032559e72764f749d7093e4e0e1fbff0a9257cb20c022afdfb5a90c16b3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZANL1776642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676da6325c9360666bc80218029fcb8f1804c396dedcde9da4215fcee153c2f9. 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/QM2PV1782431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03503b646f67823bf0d4164bb87f724105d2ab68af724109f848470c645dc5ea. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/UST8K1672621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864224edc98a78c0c2b062708d3fbf81565a7b4fb653474fc36f2108717d09da. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/UST8K1672622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef91cebbcd5f3506abc93421596e64bd1d6afc8f2d3ba7144fb73bc2594d7826. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/UST8K1672623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1ff7ce049f769beccb0a4037c19ce0427f8b291d42524961ddbc004c3afd22. 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/UST8K1672624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15141236a3ab6b566c1470e337ae449db8be46c29fdbc74597dbb07d1f5c0384. 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/UST8K1672625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c66cec1cdbbd64458222f3248102c73b4acbad0857aa89c4ed0112922aa7de9. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QM4DW1613185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017a95565f0d2a573bc8b6a2a3f18684715fd1987a1bf0f3b967f1232c7904f9. 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/QM4DW1550301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02753beac0ee462a09a077b1c557c1354ad7a6942bd0643b69dd205c725949fc. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM4DW1550302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa2067c4aba66c39a82cb2fb414bb555b14e04ab27d5c6809734abb2e7a1aec. 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/QM4DW1550303.