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 0x9e6741ef3bcad4c5eebddcc096cf94e4d957a861f9c29db8e72fa00e180ca4a3. 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/ff5b0ba5-3cc7-4e26-a211-2827f4fd3c79.json and https://artists.proofprofile.net/proofs/artist/ff5b0ba5-3cc7-4e26-a211-2827f4fd3c79.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 0xe24b91257900cb7744705e77b388fc5037353ab8044bad7da48df09de8098035. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/NL9KR2457457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2707a4706468a876b3ae84df493a59664982d0b46c8c14cdcfe1a0e12809509. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NL9KR2457249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6750f6c445a75b4e4498ef5e5a524759871ae6e35d961d6ad05758c50fb01b90. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NL9KR2456400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93d47f0e5363cf432488c5bc6043aa9f71f77157658459b70c04f31faa5c9ba. 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/NL9KR2456983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d559fbfe17278dee2e452c16a05273d38bc5b8201723b9e99849b7b72682ef. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/NL9KR2456966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2186df9c7d0ef4911cf0e86d5c177af81ff977a082aee9c23eede5c6de77aecf. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/NL9KR2456963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5b58edb03ebba66419b166eab3d29cf115cadd749324a8b09c5225362766aa. 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/NL9KR2456965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49f6b1e47054925aa9f0139789af400de68e0582ea7bdff3fd52de9c28c196e. 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/NL9KR2457204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c60d3e76eeac372215c8650d072ac048db6bc131a944958e32b2458a351896. 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/NL9KR2457202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8e7f072ffb6ceb4fdc1a61455d2817412d0a66884581627acb74658f284051. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/NL9KR2455900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b79afd31c7e3c8399878828e80d6c7ac669dc6e1b25475ba217341c2977db8. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/NL9KR2455898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be970971e01e8b290d6f6b3a5649547c8d381d434bc9ca6d2590f013c75db1e. 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/NL9KR2455905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f2b41a0bc6d565fd2a7617dfb210c165735c113efe6d825be31e5b716a68ae. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/NL9KR2455895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd5b97bbdc1e56e343b8213eb4854fcddca699d4c689089d8c220d34aba3865. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/NL9KR2455959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ece95ef7e66167c9a228b0ea5ccd3ecf405bb6d3239220779ef3d9ed437deda. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NL9KR2455916.