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 0xad1586eed4cb34278022977c3528ab0f02f696320d2bf7f320f890a681746681. 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/2662fcdb-f30e-4836-bd87-c83bb3b02d93.json and https://artists.proofprofile.net/proofs/artist/2662fcdb-f30e-4836-bd87-c83bb3b02d93.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 0xc01dfb5ffe4cc8c6a095b0ff6eb5983dd99cb7ce08fe84b4a5fc13ebb76c56fc. 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/US7VG2157105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640bc2beb9b6162919000d320368d665015830b07ace72ab6fd4baf1caa69f36. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWZ2189197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377f804ab2156c25124b3ac5cc60d37600bc5683f06485bc7bb4c08858b1d7f7. 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/QZTAT2181477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435e755c97626371fd40c924632aa79fd6349d3a01c92cad1c27d0bf563b3d0c. 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/QZTAS2218820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818937390ddf4b832adf26a291a2cd58e3232c9f913b8b40cccb248d1e3d75e7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZDA42392990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22705f6b76749c78c4d0a94cc6b80735b76e12b6f6734149a7e7838e22ec462. 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/QZK6F2356834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aabcff3df5fa1bc597896b9dcc46fc220019feabba755b12c846b739f5e3b64. 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/QZNWS2380415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf6ff810b42a7fe9b87a18c560a68d842156f5bffcda118576a55f119bd1b22. 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/QZTB42309458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93419d4726b52136bb2fa7dd1b366d122d84ec629a4ab548076c093386341f0. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZES82410072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498526a74d98451a2cfe2443beedd01383e9896c7cc580cadedc8364e6c80ba6. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZK6P2446869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f92158361d2d8c8c92b8a18b4b259aef14304b51ac3a7f99a464b684d9a73e. 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/QZK6K2427237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b03de71ffe2628b394a07c6148fddd80f51d2a8f5380bfac5a15ff309f141f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZTB62486139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bcea49cf5d2c4462e3d4d185dbc358ae9a059feadfa8d3232af4871f49b5dd. 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/QZTBD2492600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74eb6b68ed5a2e0a5a6ec5cc7bf1d689b5ee9ca0c18d3ae166af1020b4612b9. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTB52518980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bcea49cf5d2c4462e3d4d185dbc358ae9a059feadfa8d3232af4871f49b5dd. 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/QZTBD2492600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b03de71ffe2628b394a07c6148fddd80f51d2a8f5380bfac5a15ff309f141f. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZTB62486139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063c23fe4b23839d90ca38fdff0aefb491e04e92658e4a7cdb066ba0278fb222. 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/QZTB52518983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22705f6b76749c78c4d0a94cc6b80735b76e12b6f6734149a7e7838e22ec462. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6F2356834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f49befac92d4d593fd77510d25e2f1ea3b56e239b50e600d3deed28b7e7e2e8. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTB52518984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01dfb5ffe4cc8c6a095b0ff6eb5983dd99cb7ce08fe84b4a5fc13ebb76c56fc. 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/US7VG2157105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97eb29caf2a08832c2a347d38b18ac30f7d3922067e4328402f96d28a7a08c40. 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/QT3FB2536935.