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 0xb698f9239589ceadafcddd92a355a62e8cb307edd0bb0e689c8732c7b86b529c. 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/948966b4-45c3-4fba-b2ef-b573ae79f23f.json and https://artists.proofprofile.net/proofs/artist/948966b4-45c3-4fba-b2ef-b573ae79f23f.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 0x0eca4b90d099a2a2d193d5dd07c899c2ffc7d868428cfb85d32f7356ef4c1fec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYZ2252325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3f07f7ee96aedd8cd2c57c19d2fea6cc590c659d005d96dc22f714482c750c. 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/QZFYZ2252326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b54c65ef4d8f42ccdb232a163d09b644e94ecd248fed2ea5b57de9cce6d858. 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/QZFYZ2252327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae68821c18ed1d8aadd74d32659d26a7e38c7df65ec38a2a095ae8d47525dd38. 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/CA5KR0007804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f91be27a18308dcd911fc5de1162693f2e879946feee6796f98e031353c5fa7. 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/US6YC2103648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa248069f12c9721302ab4dd74472bf66d8ed46f1f7e29ffa6724ee32256ff277. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-20T00:27:34Z), 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/US6YC2103651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2256214fdcb8c6b3a5a6b4fb43b117890a3849e5acfb7965316df5d658f7d40. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:51:24Z), 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/US6YC2103653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd772fb220148782cfb080ddbc032b153607360850ec1a0d8f67b54046997892a. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T19:01:16Z), 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/US6YC2203781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7e2d1a119857c8b8df578d569971ec8d74d8d6de81250e2f1207128ecb1ee6. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:45:51Z), 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/US6YC2203789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a119f930591cda7816e2d6fb47b542c9e6d6ef54c16285d520cc8bc81d1686. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:07:22Z), 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/QZK6K2223240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0844690ac54f9162a1e2fe6a883cc775aff38e8d29fcca5c41208ee02982c74. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZNWS2278168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe252e4990b8fe9a97a55611e43be641564d153e61fccba6b78cb597b4f7e5896. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWS2278169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b3d7647331bd7dae1ff3b806c76f1074c37d7cfa71fa1b1c9043ea5bfe5fec. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:39:34Z), 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/QZNWS2278171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39c52985afedea8f8545957bf80c0686ae8bfcf8e3a6b8c9b5a272dc0ef299a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWS2278173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8fe61609d2a2e720ffce0f7381a6dceea2baac2ec23a5a5c5e7719fa9f68d7. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWV2392354.