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 0x9e4ebe7a4da408c1a5fd14ed3498becaf6ba1a36093d4af1f03ac7940fb1cb08. 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/100b3e47-9ce2-4d67-9748-59d0cf661668.json and https://artists.proofprofile.net/proofs/artist/100b3e47-9ce2-4d67-9748-59d0cf661668.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 0x7a3acabcdcc1280e4fae0763c9f3a753d014d8db0c250f82b5f8d98da4b95647. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/TCAEX2018303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dd652435ee0ecfa4b8bb39039daa7e1da8d0bef851d8e24216e11f11fe4214. 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/TCAFC2097796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e262c60150b7abcf5c6200389762439c55f8f72c1e4cb72f4863b2c9b0d7a50. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:22:45Z), 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/TCAFK2113594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4728035a8e9f411690c86ab0f945dd403ec0da68d8b839fe2f02703c652937. 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/TCAFM2183135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4728035a8e9f411690c86ab0f945dd403ec0da68d8b839fe2f02703c652937. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/TCAFM2183135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd614392436a7ca3309550ff2afc0457aee73e94fd0b0fac109a20302370ff11e. 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/TCAGN2240555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07d7a107bb49f565338ada0c7bebd7410757616fc54455bd04a8c9b0017e999. 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/TCAGR2274600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3364496c8f242d6cfb79b3b8d92d33cd1ea390c5060841935fe230f02b28edfb. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:42:27Z), 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/TCAGX2344510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cd0ac81cad3e20701945504998e2794244ec15a4e6c8f9b4582fe11ea0a3ab. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAHR2334154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d1e9ca5514947fe42b98a359646021682d348a1029bffda87143b8c814973. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAIQ2478132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d62380727443a92068b6869ea2cde8ae516b46a7aea27cdfa661c2b744a6126. 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/TCAIR2437994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca160375961d1521f04029aa49e90342a634537e4850385a3429866ffcdbcc3. 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/TCAIZ2431201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69231175ddddf7125a0cdc7a9d61f31eaf61504a82a53f69dc7cebdd3e589b7. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAJU2590404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf09b31f2586d8069af41ed29728c82d1b83df36dd417452b5402f5f851973b. 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/FR8FB2403020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf09b31f2586d8069af41ed29728c82d1b83df36dd417452b5402f5f851973b. 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/FR8FB2403020.