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 0xe900d72b408072529ede2908c9bce741876b9876cb24ab67f783e5fb942794bd. 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/630febc3-e7a4-4589-8f5f-15fe46855d82.json and https://artists.proofprofile.net/proofs/artist/630febc3-e7a4-4589-8f5f-15fe46855d82.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 0x3b40ee6a0f7db8e1674f898a136281ebd71a85361ea7f7b98906cd6b59d261aa. 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/US3DF2416237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0998253be5cc4bd14ae1f70ebbf5b59da5406803591f34f51da4ddc46f0350f. 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/US3DF2416238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e425dcd05f697813d1f149c124ea5e47f16ff45ecb12600e4d2323c22a0526. 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/US3DF2416239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cc03770cc8f268f55eab4a993fc7c829ec153843cae65291211f660f093a24. 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/US3DF2495391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29d3d8168d8b2229f89db8a16dfee7c3e69bf31fd649c74fe892b866f4a8338. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USANG2271306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb521f02960d762e2ee57671861da8f808481649cc169421b97db30c7f54fc117. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USANG2271307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ed784561d5687edf52e3fa873e96515ce915d7492ac0805ce9422e171b167e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USANG2271309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bcadad4816cb9c794eab3fe03eb593c817f281edbe14d8259081f9ff5f4233. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USANG2271310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6ccb91ca6e0080829bd286ad6bb43c7e51c69a99ac7ee3d8660e6effaae3b6. 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/QM3DF2223743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878829861c8842ecf4c26577f1fdbad55db1d86ca1944d62cffecfd481939fc4. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/US3DF2423870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88222211bc258e51194a92402c7a0a0e23b0c7024dc1d06ba4f245bb09ef06c2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US3DF2405276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b233725360fc305e477dcd47020d0de96a4dddea9fcf7f828f0125a6bf1caf. 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/QM3DF2292569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703c667cf92b5687aa24c9d106f44118c8b987217b665b6a1e3ee9ee4a6798d1. 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/US3DF2416235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb227690438e7d48bdb4640171f456b0ef5e29833214503ccc1f0224fcd12b595. 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/QM3DF2296707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0530b2b13844a0a786c9841de35120b8f9388d2f99a127540083fe255b5e4940. 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/QM3DF2219383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb82c7de7f04d8f813dad8ec2458c5ba2fbf788a6b91d0d2ad42336bff454b59. 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/USANG2269736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13ce4f0baf3e54b31eb4f480e1da988cc3a8dfdab18d1ff02d77c35e394febe. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QM3DF2221057.