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 0x4debbb8041ef96017f6eaccf42587efe1760f04699ffbb648d5024fdcea17f1e. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fa880b6-c3f4-4b21-851a-3164869dd503.json and https://artists.proofprofile.net/proofs/artist/8fa880b6-c3f4-4b21-851a-3164869dd503.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 0xcc971064af861d39e7d864b09a8f50ec03060c95d27f4920e5fb05d847541a93. 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/QZK6F2364337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ab125a565f6a91ff4f5d82f40b55b7812feaf125c34ab26df5013f443cddcf. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6N2362188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a3b8770c2868e9f6df6156e174ff609131d92914e53e230a7c0cbdd5b75794. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72102866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191dd8756bf0fef460a8ef27528988cd9c044562d86a5e6bd8f201bf7083ee08. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZRP52402456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9084ec8b481653cfebc532e9069edd923312a3e2f9bc6c3c3688120f2ac5cc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFH2362081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe817d1b76f44bc2e758d50bafb6f5ebcfab25967a288e43a5e50d80dc1241bd2. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHNA2383173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0636b16f5025ae7e8df2789143f583e609693a8965267c3a4331274fc94e7539. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHNA2383175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f8d3934679b725caf292d3a9b777443266e7f4798aac9f3189c3c352e8284d. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZHNA2383176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763bd15d86dd5bf1fdf915eddee9a90a1679af3e9b59ef0d4d2bbf1fd6450acf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTAT2280799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69221bb910a6a50e4d5d82016b8fc8604e8082dc6d4be8fe69ff32a2adc0c467. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZDA52234356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81656901acf66c1b207e03d61c540c3099b49f2bac923523b31f36d01315a4c9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN72137406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837efc2fa44714b8b164f859c887d661b3e8a36ae478b6d09f3b3b3044bff6ed. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZNWQ2018839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063d24f7b35f06427b38b83074e927123bdf63d12e6b7c971655b7bf1148581b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEE1947429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1aa8bb5df60fa67c4156c45810f454754df76cb6257515fa0a40f2e61b0825. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRR642201765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64cd142508136f014bf9933fde4546e188fa2c9cbbc58381858ad7523e63fb2. 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/FRR642001703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d48c6c046a6684e78d65e651e62829f8602757e917c3451ce298645d7c1bfc. 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/QZES52215236.