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 0x1da73740fbb85ec0d46fae8d1301ba71a6fd2420ffd45a0ab40ced5accd3b72f. 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/631cd048-0499-44ac-be8b-9a4ae44db8d4.json and https://artists.proofprofile.net/proofs/artist/631cd048-0499-44ac-be8b-9a4ae44db8d4.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 0xb52c155576154beb7d6ac691361150a86c20a163922418b977c433eeeb7a2724. 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/ESA011935363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3f7e3f24853ef5d302f50eb801439c57a197a07bd8f657a7028a8dab90e8ad. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZK6J2051626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889e7cd7091c527996731ac11acdba5df6abee513dcf6f7d978077b37b191b48. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6J2051622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6edd33ffdcd318c148b76e88d922e94dcf9cc4bf7b8fbea7f8f655c4906d94. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/QZK6J2050434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65109fbaf60e603f28196610aff3b94422e635b0ab3e0d64138aa85bb8259efc. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6J2053008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a545fee76c34c2e7d78fc0bbebc294261a3bbbfe12132294699c6204923ebf1. 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/QZK6J2053012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb295c9e269fc5bf32baf11f1e1498fce71bf25485aa21eabe83cf338cf50d6bc. 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/QZHNA2004932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912f65d5f88b59236a5c07096b93d29f65eaa9c26c331cfffced2345b26bf47b. 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/QZK6F2062170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b65a56d8af6d3ef8bc4e99e057991637eeddb9ede048ad2d079c2fec14310a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWZ2077684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0560ef97a16fbe58f98432edbba1dc8fc7e61b36f7aa48ba681708188603493c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82199007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3c7e6d621c4014ffd7a8759268bb2c4c6c6fb1aaded5159593c94d22f07622. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES82156954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b2ccd3ef07fa1bf3459ad0d9006c4982260a1d401938cf09c644468dfbea95. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ES64E2303491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fcb3aa041082286b0a84edec0af2cf6c834b6ff3356201932d2bad19db5a84. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QMFMG2334624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b043fd3e2e387d16cced684b9b2d44afd99ee3fec361a3cf91e6b816271ae9b. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QM4TX2482637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe569ce7fe7f1bfb9a3899a980ea90a8598d23748ccb3f2ac29d3bee68017dd18. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/ES64E2503641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1cfad88c90f3f4e729796ae7b2b0a1e602b72865c27462ce43f3f812ba7686. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ES64E2508129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3be920f92b7bf10aa9691d4441456e417c08196a9e5285f428252358ef4a2a6. 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/ES64E2508130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea6d11241af888d5716a60b18ad8b0fd3f4e45454be865c5389a94d5946dfaf. 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/QM7281710312.