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 0x0131e82f2bda2a808a42a563f0d9d9e15fbf85c0a4983e505eab3fc531418705. 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/43f910dd-10b6-4be5-887e-d1e25e3e39fd.json and https://artists.proofprofile.net/proofs/artist/43f910dd-10b6-4be5-887e-d1e25e3e39fd.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 0x9c027b54538d32753801d9070698455f00e9804f7f76f44a805a2600eff972c5. 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/TCABM1350694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e48621a312c3582c1b22deef4b02a8da4b4201867650d07ecf1c21c592266c. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCABM1350738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ca38bfa78e9b3a9c8a38b3648770589e7e44057f12dc2d7cbc6828f66ad82f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCABM1350768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52ff08abe815c03b2e3d8dbdccdae6789896561fc37e1638b5745158b09445d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCABM1350772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28575b85f6c980ef1e137acd6477344f5577fcdf69453253f2e62569384d040e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCABM1350799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb00bd951f7bc5eb1beeb73fcff045bec62db1dc980fb715328e8ae6d2e4ca45. 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/TCABM1350809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2deb9bac0dd3462e3a5cee57aef52a8b6a40e7830633b43116b54332e0fb9f2e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCABM1350812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ed0a6ae29171fc66812adff071554b67745e78748ca87c0c0c8499e78e071e. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCABM1350836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02db903c517bac431d067c0ebbbcf678b02536cc5f5558fd3aa5686858fb3880. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCABM1350838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c0e1aa398eb1f93e585a29098ea62f023fc902967373fe390986bf0247d3be. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/TCACG1547675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7521a4c093a4c9a89c598aa0b07b2d7912fce8fa9499807580ab377306f59351. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACG1547683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e59f434165a68cdd59994677f483bb78199368a7f2019a20df7cadf557fb3f. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/TCACG1547685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf3ab20ea1a474bba91d6b438b627fc92df307de438b7ebce4daec95c2dc712. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:11:02Z), 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/TCACG1547689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfaca2b8cdd30000fe56905d2ab4736f74a412d83f93c8f0dbdc0c81b83ad62. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/TCACG1547691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd30d710e089746e9c74e05dd5f0b93d4442f27efb5aee543482347ae39516ac. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/TCACH1519143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c24e822ff2e4c9666273db8483077ac8be32f9b5279457c65ad09fc0d1b9ea0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACH1519146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49296a31f288ec572b240beba50bd2235a2014960499cafe193b72c826876f83. 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/TCACH1519149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcec61617a3920387417a83b047d1700c70b3e7bc9b5934cc01c4066146d060a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCACH1519151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82680122c1cbc14269b751673edd82301f3f901c29c6438ad658f8a02ec24b91. 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/TCACH1519155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5852c1a843b69f6059e4ac97115485c7a9160cbf06738055800dac47315f9b3f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCACH1519157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052f65eaf5fda6a5060c671c59fbf9b6f367e11ccba6e9b3a8fb79717bb6f0b1. 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/TCACH1519160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05c8b6f90b23bf1aca69928a8d698e370c05aa14e74b6c20228a9ca5469a3dc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACH1519164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adcbd33619d2b816428b422af03b5f992deef2184cc23c72e57f967901df22d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCACH1519168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92902ce54931fe07544d83bbdaaa4baed6bcd37a7cb4cecfddccb192256b83cf. 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/US4WJ2022409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa532bd50633fc602a17469aad080362fd506befad355f8dcdd967518d3158f8b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/US4WJ2022447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689e1741ae777119318e58c06baad94e8dad02f43aa341f998943a0e0ed8de35. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/US4WJ2022501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51a286d308361086931d207e25a9dc3398087c892e6f7b5a1a2a76a989ce77b. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/US4WJ2025610.