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 0x583c8e154c1404081f21d7ec0bae94db79e340d4ff6ee737e39ade155da977bc. 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/0b367c04-397b-4605-9ff8-563292194d51.json and https://artists.proofprofile.net/proofs/artist/0b367c04-397b-4605-9ff8-563292194d51.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 0x8d4eac79c68da45d26e51e60f4749494a06f7e72c7ee7773c2be41d7a9c21758. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DEQ022010357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6791b143604b2de0aa0031734950fbb2ecbe58ebd673bdd4a56f0deeb05f63d. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/US3DF2219779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfdbcff96e31b063b9d67e41c27db3f2aa7bdb62a91ca81207dd2ace80baf6e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZN882231949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd210086672654cf368979c09600ba4bc42d3981f3bc961c1280e4a8acb9d343c. 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/USANG2249100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe0573ba1bc8162626d670daf639680366702236b6b57f7e584f1ffebfd1f80. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USANG2273707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81a46e8268ea8325c407a08dfc87f7d3e384aa68a0605dfed993bdd2be08326. 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/QMANG2205783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250dccb89f363fb38cec58ac5cb347fe315b1f6d000149f7562aa9a9ca82cf28. 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/QMANG2213281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ccbc0bdc897181194dbe14017cbb357700f1c5dc6c17bc779e4948c899d026. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FRX762498085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21824b9f1036c3e8576d1d290fd51986c72063e56cee5295b967807391d180c3. 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/DGA0P2498666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9de05ea55cf74b3e91c344b8df298904acb43086ded2ff089c8040259911a1c. 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/DGA0P2498667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fa4431c4f17ba48023ead7746b45811e6285de64c39221ef12af1694922506. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/US3DF2522114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75b63e0690f9229845ad3539e7a405e93ecf759d7f8c5c23c290a39ca8e3427. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DGA052566422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99f6776613cabb1b027f74c67249e213b7457b1abf44afe1d3013623565567f. 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/ATUM42100205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2508b7de66e768f0489d0c3a201991c5ce56c3c506b962b8ca03d8b3531d23bc. 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/USANG2210440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf51d224648d33f69d13a88518e64693c8af6910ece32040799339a6792358a. 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/QZN882231967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24413732cc6c3a6ddfcc6714de356f186c5585a7c29c3c1c4c1b61535357c95a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QM3DF2141537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda405eb469111273ac38551f2e20e6b5562f6b4e823cf5655ea3c5bf736e825f. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USANG2193348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe207f114ec62d48463e5b43edeec25f698a599739cf281a893c6b4c9f83485. 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/US3DF2417657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998b6497c6ee10b1b9ca52112a1d9bbaafd0f6f13a6d05864189041cb4b93f97. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USANG2098654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998b6497c6ee10b1b9ca52112a1d9bbaafd0f6f13a6d05864189041cb4b93f97. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/USANG2098654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a238512dc60b3ea2c0588bd814044b1014a9b93d89dfd5d4429ef75d17bef4. 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/US3DF2076775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea95fae9f30ff7185cc87f0024537dd3392932555a84a23ef947b62c50c4ff9e. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/US3DF2113982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76e8e490dab079e3381b9a0b0e4d9303e4d999d9306e1ad896966abdfce4f14. 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/USANG2233431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1596ef7824404bbee8453fe30b3940d29465848353f814d2faf94601e1db4d58. 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/USANG2169186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcf8643e68fa1c47dd8e0ad37598a0978be905c7c7dfbbf1fe733610ae95cbd. 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/QM3DF2270049.