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 0x68fcaa3efa7dfc9c22b5509f4fa397162f7b4bac06a9805807e82d513c5a7d14. Chain 2 (Bitcoin): anchored in block 953973 (2026-06-16T16:37:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a9f430b-3a5d-4c29-8dc2-419bc7528226.json and https://artists.proofprofile.net/proofs/artist/2a9f430b-3a5d-4c29-8dc2-419bc7528226.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 0xda306fee80d95bf893fe81019851d3095452bec4a1986d0d8066a67fb39d9830. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZK6H2584180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f80ed0fa6965272437fd484a4378c6149f521f395c3daf7514b055aa3e060c8. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6K2538266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2eba440f061c7442d8301dce3218b0ea1147ce038bdf500fc31c638ad2c9ee. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6K2536740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1adff6ec6f37885585e902ffc6bd5ed2a5e3be8454396a20639767ae135ed4. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZK6K2536741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1e51c4b99a9c87f899e335116dcc48430a8e4a6a1c5520ff239110a56f0dea. 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/QZK6K2581530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fde9a2d9af24bf9ca3fab0efa040c842a0ea66833a73fdf9526d3b692cd96f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6K2581531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf00d8d0c8dc368fd8b9f12e9a40db653066cb1745e0ae5d551c2a0608fd536. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZK6K2581534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95557a20e9d2cc67264e22782e2e3efd18d6d5f6b8010648f235bf3a8946e900. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHNC2500092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601ed69f2a6985cdf6facbcac823835f1db4a34318b0043446d2a6f2ee3e1666. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZHNC2500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ded8c4860e56fb2c2fc15b059496b3984147b9f3b4854f6c0725c68d6b15a90. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZHNC2500098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831323f2f1b3e9950ce66b5eb1c008b43cced3ba2f51c91d28dec8fb70f3b776. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6J2544827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf75b41b454a4b261124816652c3a5a639bd9489484bc05b97e2e521c317406. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZK6J2544828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a1b01fa6d1e742f984c2c6406fcabf5d5e65ebfd48f9195fc2aa199eaf54d8. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZK6F2501889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478ca977141f445539591d37ddbb1180e4d98a0f96798583ab7140f59dacadc2. 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/QZK6F2501890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4baf98947f9b005db06461f86537b7555248c3735762479f8ce241d4404ab8a5. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6F2501891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351b08c7edc0afe3ea360d225a112c547c08ab53dd3e79d15effdc8ca38423c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6F2501895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad28b30d53d876c7dff2a05b7b9f3c27c1fe73e3cd3a09b18eebc131bd4d5c3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEM2596901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04fe8083a5dee3818782bd6f2a3b1364b98fcd9caea29285ae7f44e8061f1bc. 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/QZNWT2519414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc740df895991ce8ecfc958c8ba5c2f138d656c0baeb9f17f28b2c3ac7627327b. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZPLS2599921.