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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ff30a13b6b0f602cbac2dd3c2130fff1eb46b56ded9c5fabb3a2d43335d936. 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/b452d6fb-64ec-465f-8f05-18f5b11c1f1a.json and https://artists.proofprofile.net/proofs/artist/b452d6fb-64ec-465f-8f05-18f5b11c1f1a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a61bb252b3dcfcc475c10ec4638768d2e24e66c5c845cd9491c2addb46cf51. 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/ES18B1600471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b586308c4780e0deb846eb38ffdb6ce34efc8957df960ddb0f92ddb8e6ff20. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:43:30Z), 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/ES18B1300902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85df682c5600bfe0cc03e31b514e1d1552edee67dfe9196c297829885b83ea8. 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/ES5161604331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd998c6afc93ca7b7420df445c81ffd98463f556f3f052b152d9a8722d86e68. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ES5161604333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd173f334bf23682d2eac66c46d401e6db7174201f4dd15d95b20aaa58d1efc55. 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/ES5161604335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98e577f26c72986676cf911abbaa2a00355808eebbc4514fbc103ee15656442. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES5161604338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07faf9fe23d659f6c8bd5d3f8762e5c868ec1a3dd85548d69f8e3809a62fd53a. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/ES6670202970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7debed1f8da1141a8782705666f1022109c9402c6dfb5e413fa1b8aff7ee97b. 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/ES5161704666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecfbeea25861d03df3a5b04d1702d180a61d1f713d1a88f52384528c9de6929. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/ES5161804772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0fe6cb0a478f7557d0a8d00a1cd44c8415dce17c7d69d63a62275ddcbb0d98. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:05:59Z), 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/ES5161804777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b178f83748ee7cc9fd0e7f1e00e756a981ad135b09d7e81e23eab4870bb5995. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/ES5161804780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edf416d64d63a692a850d07e6ce84ba06d7c8c4b78e84f3b02814455e64da59. 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/ES5161904911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849c34e933170f1b7c05d40da801f52a72533ca4fda11e493c005c1cb7274732. 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/ES04D2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd5bae2d04783c191845816d07d789223c309b849456cd1aa1e19bfe147012b. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/ES04D2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f443af7aa62e8ce122e0234e692f4d0821e6269e473695fe02d6ccfcfa21e4f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES04D2300071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389738eae270425b4ceb094d63e988fe9979997a207222ec1c0524401719a7a1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEYX82242466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645f6c03d55bb8ae38161a151c8e412e2712299796f4f23af2d1b6136362ff23. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ES5161604337.
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