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 0x9c7a86e179ddac93d3e6037b190ed1508158c00ea0f910a9275da651e7398fab. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb9f909-aec8-468f-97ad-229d20f9c621.json and https://artists.proofprofile.net/proofs/artist/7cb9f909-aec8-468f-97ad-229d20f9c621.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 0x130c72f3a251b1dfdd20eabedc04e44db7cd8e179690208d71a70e0a0c6f8ba6. 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/DEG931913530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd704fa7f911348d752415355c3201d8652ee63093cfcce6a800de2cf4ac793f9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEG931913532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53eb5a789762287f541b2e3e54060c63927301eca7409906e2da616defc59e30. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/DEG931913536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ed955d83b5ba45a71afd46128f574e1a56902f13f9b101af2ad9f5c234a07d. 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/DEG931900087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c862e2e1e599bd89348cd29a8b51552124710655d6887cc89de927211856f1a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEG931913543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ca3e30ded1d066cd0374442214b4627031a40fa74f52b0a5ea562ae919a260. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:33:05Z), 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/DEG931913544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9085216a6e6a77d2dde87119cdee426fa8e6a3416cacfe5bbc57854a9db44fde. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/UKZ4J2100502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d46c554386692e0305095e79a1fdcbca50415232cd89ab8c0ff1e0a07175c3. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/UKZ4J2100504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d5c2a6c7ed0d1f0acd372abbd3ec347c13a7bc2318ac12f47558293c592f4c. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/UKZ4J2100506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f94e32970fb4bea0ce42a77f1ce82ad453781683ad8cb451e70fee6b78e588a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:32:33Z), 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/GBCPA2301835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093abf3942aeb47d6ad2259e207b06e119ed43262f6965af6ddcac3badf4ba33. 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/GBCPA2301837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fa50c8105448a5b4ce9315f33fc9d1183712bc4bfc0d1587234ae1f169b0e4. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/GBCPA2301840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a2a932734ada665a99cc57c62fe9a1d4e8a8e43056a566ed9e8ff32304813d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/GBCPA2301841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae88bf051973eefc7831ccd43bfb1d23b5587b180fc411604cfa67acd240a50. 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/GBCPA2301843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817e3f1c716e7dbe84543d640efa2e5fc42a625d3686ebe2fd7b2aa3f7ea0f71. 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/DEG932102025.