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 0x4d5f1d43bd7b772f69543ea707d8e801b411c3c55f3a1c6ea3990e59b1f89ad1. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5b61c6b-d15c-4245-8b58-fe9281248a9e.json and https://artists.proofprofile.net/proofs/artist/a5b61c6b-d15c-4245-8b58-fe9281248a9e.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 0xc1ec6c5d7fa25e9c37d92650ea1516d26fb6dffd925ab42c23aefce2d4d6949e. 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/QZDA62284046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31cdb75e1f7c8a501bcd0e34a9390637f3d3b912034d69709fab4bd62324a1a. 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/QZDA62284047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91484913fe9a6252f5c9ffb295d5122533b5fa4d493e26e50e68370c1b87e72. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDA62284048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3f3d1330a80321450969ad788b14262eab4b7bfc3883c1a06e48039478ce44. 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/QZDA62284049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fc49d19e68e7215e9bab2237ef602ebbb8afc811cd198369f56819fa8d45aa. 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/QZDA62284050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6178908002621eae88e29aef28c382f910a9ac98b59e9af5cedfa215e07d5e52. 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/QZDA62284051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7f1e6fd4ba4cc3604475c5814837f99d8e80728bf392f9f63251784294b467. 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/QZDA62284052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ad77604fc6ab274ae7addb2d0076d8b119a46ff681862be2ba23991dc2443c. 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/QZDA62284053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972d198fa96300d40e23a1e783d4f88b686011c70efd1b48dde7eec52c578206. 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/QZDA62284054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e77808ed2c297ac6b03a6e8a0d155548398a2fda87d79ee7cea4eaf124ddb4. 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/QZDA62284055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f068789ac8c8bd31453289ec63a0d23b17890843bbf0f709e479a4a500e934. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZDA62284056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1076dd867dd115ee4962d3102d33bbada0ea96b016a88b3adc1a351fe9f8ae03. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZDA62284057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63ccd0a9f5fea0fdd72c9902a78b08630e5f519a11dcf6fa28feea51ca27d79. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZDA62284058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4133945c811d813e313c201ee9f4605309f225392b18d8e7246c858b6a51890f. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZDA62284059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc505f91d5bba232bbc9146bff601726fe4000cd3c14b8507697455db30f624e. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZDA62284060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf28419be753df3910c200dbc6e0c875359212b35ba6cea006c44691ea69824d. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZDA62284061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf190e28de97b687519909288376e68f06c97582ac2500f8300cff8099e50c5f5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZH5E2445033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886a164b4b6fc21c8996b244db0b45ee1e011d2763bf30712cf04449ae5e9f19. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZH5E2403157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1863e13dd37a364feef010597a21a8f0d3614d4f0e6b431d4185842de15801fa. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZH5E2403158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48988c7de8754fe02ef2d7eecc5f01f1f80ae14f285d884061b3d972df22b7fb. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM8DG2487565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e64997cc7f6e103f53e1fce7803815c3074a30b76a0c2fe72782c92eafb6169. 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/QZTH92392237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fb6bdae275351c5b6f54bab9cb11bd2ecaccd8f413174fefe382c764e72edd. 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/QZJRB2251036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0991b7844f328dc04b8bb7676bc21693002c8c836ba9f740f1c3be4b1f3c07b. 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/QZHPJ2276135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32046e05241144f801f88b3e72a7fa676fdaddbb5f54941f6e83265127821b3b. 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/QZTH92210567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08d4835f6a34018d3a9e482142ed19bae864548c5c148d6b40bca2231137c11. 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/QZKDK2278293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b0246c92c0b32c11688fc763d904f91e23be488b6a8e08ae3fb9f68730e42d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZTH92238873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e429a29f218d088eb7bed025e7c4bccbc776ad96203538346911ece1089021. 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/QZS662161722.