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 0xa0b5e13904119a53055fac27b1af0a85f2d0a2680fffed005cf91ac873d32628. 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/4923fdf2-c45b-4998-bc47-7179900a9794.json and https://artists.proofprofile.net/proofs/artist/4923fdf2-c45b-4998-bc47-7179900a9794.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 0x37548f085de989e9adb6e75262a72e2c1079f496961f846d5bfcd4676ed59d8f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NLQ8D2200331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a49bbbae6ead7678b7fefd29e41e88dc534f9b6951faa789b3d586fa52e24a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR59R2461294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcf6cc1cd709c163b992c8f6df388f1d9c84ac212031f36f7c3e9db60082ff1. 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/QZFZ32415759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a2ae3a2b973e944ec91b60d6b24513801078cedde975ad61bcbaaed75931f1. 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/QM4TW2338490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b4f81c98a2d08b72e64eee6d5268aad2cdfa54c62f54c517ccd960c7e19182. 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/QM6N22226981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4283711f05de6d211493a20c518a6407ea5076fdd2908b337a72c70582aa0d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NL5WB2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605ec77b90a5a1c21e0042f1389d9aa6548c5359265e2506039241b6571a0d4f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T17:26:12Z), 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/DEXO22077834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b524887a4a6db20f92db745329c76a0aedee656aaa10fa51cd82f6aedfeb6f. 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/NLQ8D2102245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb2b5a8c6ae3729532cccb09366d89aff9886ea3c472bf62d1c838a70e5c768. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ8D2102249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50d408fb770110f1f066a045b367de5248f08b0d5a27a11e79a59a745176452. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ8D2102255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956d76d0ca5433e5d8082363f9ac000bb06a4c41b5fc41775704b6757b643f37. 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/NLQ8D2102264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a2afb3b152b072e3b79f566a2307cbf6127f031bab120e315d5aababa6811b. 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/NLQ8D2102266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d51860e9cad35b797e6cae988847308990b0acacbf175520f0a1ccc0bf33992. 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/NLQ8D2102267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a8f24fe6fc5840ea551d0f46d80bc6e9640ae3863da3684abcee0d36289d83. 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/NLQ8D2102270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d1c3d7a071fef263d66d98eb029fc7e63693829a647aceb21bb9ba6fdbc8e5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLQ8D2102272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ea2ee4c2570210541098daad7003ae043f88952115d558b1090c9e30bb364b. 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/NLQ8D2102274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57eb6036b5d7729a225c9a205e9eb047c1131d9bce42c93586dba4a857db56bd. 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/NLQ8D2102276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275918c58c9a1ff8c5b32e09442a88e19e49cb9d014118aa969471a6b71e4744. 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/NLQ8D2102277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6f7f1ec47be1deabeeeed9020e100b209185774a250873f40ba50a13fd8b9e. 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/NLQ8D2101567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dd23e764feb2bbcf8370c7fa3efe5c90ef151f4dea8f787e9a1a6f22ece41e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLQ8D2101569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f59681bc78dcd5c81171f2f8baff143d0578ebe74e21b6997f0f7f99303736. 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/BEIW12500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b11cd465055bf72a18c67c12ec9f4d2272e04e1ac3bf74a74bc3fd8b20f459. 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/NLQ8D2400873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c290248291e3692b38752cab719fc2e69c83363885a7993365c12a752eee99. 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/DEPI82444208.