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 0x39384fd65dfcd023b97e075897c5075ff79a17018c93070f30ce5315beea2314. 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/e1eba5aa-18e9-4de9-8f43-587c15a468da.json and https://artists.proofprofile.net/proofs/artist/e1eba5aa-18e9-4de9-8f43-587c15a468da.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 0xf5f19be616efbf39bf96e942ccbd349feb1719acfe631a326e38eee34b805090. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZFZ62389738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0725855bc61af1dc1821e7f14ec87e34ba4633a79d6f7e610e3bdfbfa5d62bb8. 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/QZK6H2377162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d897f7e4ccf446e093b06eb654ad0387fd82ecbd3d8abe1ba06c85ed65deee6. 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/QZTAW2305589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4973370e54b2a878812c9537a5dc751f285515859e73eaa9528704e569a8cc8. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTAX2336608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241bd79fb3373733536299a61bfc20b982531a7bf913cae175d04eb9757737ad. 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/QZWFM2313020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ee99ce1174239b5bccbe75baedfb5125aeb2523b3b155d45ca13b683be6553. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTAW2443806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef65d3f5e8ca2a1e9e52ba6dcc26c25b65a015c61c690afdf4a06f098b7f95ad. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBB2400441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15644507c39e1e851c3523d32fd1b723f239fd36a4e1a6ffa48b1b66fede9cf0. 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/QT3EZ2418725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f67a61834fa5be8147379bbbf483bc1cdfa5bacedf738973c8affd33ce29e5. 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/QZFZ22533636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9711da7a461f97945acbd0b5c2acbecd5085e0dbb902d61b8ca2d5916d0a08de. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZK6P2550657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cf0636b0d57d5f1901434e6729345d99c5cfc6be665c7525486dc9dd157522. 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/QZHN82599222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0540a8cb18628f1ba7bf50087f2fae46dfe64bd3f1ae34fff15cc31e74f29. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6J2590816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f451f1e19d3cd906d03c05121d3ffcfa1215775b8174a36b2dfb7fd7e9a7025. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6J2590817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e98acd16d3836c20e7f63806bf811c2bfb2eb3cf94be6fe543c0f5ad49f479. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZFZ32518951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9711da7a461f97945acbd0b5c2acbecd5085e0dbb902d61b8ca2d5916d0a08de. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZK6P2550657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4235dc42aeba541432aa1d786bd71266d0cc62a8430d095bfbe81990ab7782ca. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZNWV2439007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf45f45a25963eb4dbe900c2befc32e7a0bf15200bae80d8d75de9f631f08e2e. 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/QZK6J2590819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15644507c39e1e851c3523d32fd1b723f239fd36a4e1a6ffa48b1b66fede9cf0. 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/QT3EZ2418725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a637067778b74a1103c1186d83d8e08cbc9965065d47fb5eb77c05b974b2e4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6J2590820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccae356c93980bc84b4841614e23269ecc11ba16b2a8c8ae218ad16b607b22a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6J2590821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf75deb0633acb3569ced6830623c5c5aa8357cccfc8e79056609e0ef3e77467. 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/QZTB62555586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2523297b4b1d8ea60f7d132956adeff669115d6965a52b592d87144a6ed789cd. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTAX2574594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146c6c08cfc63eb36d18dd9b1e6943554ac15b6607a6a8876d4f38ae4488d5b7. 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/QZZ7S2536092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c4710e7e7e47fadd4a51220ef4eb99bde50fe99231e634573b3ae1b2fbf527. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3F92598272.