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 0xe82df1b6ecc046bbcc8379e0e442eeb3afff5307525b61fa056e8a0246f0229c. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6345b861-78a0-4c3c-b3a9-c2406a16b08d.json and https://artists.proofprofile.net/proofs/artist/6345b861-78a0-4c3c-b3a9-c2406a16b08d.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 0xc35d1ca3c4312982d63480158396c2b5830a96857d1791ed2cbba3cb43de490b. 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/CH0011900366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9443dbab42ef154999384d79a5e0f8eea6d74f5cf549863415d02dc2aabf95c7. 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/CH0011900367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b04d60ac966eac50f6cfdc0d5c5c0f3e985d1ef1f6e3175e14fc96dac09dfd. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CH0011900368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70fd2d07c74d930eba335b4f8b2a52a786048549f4f7f1e0a0186b2d95f4591. 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/CH0011900369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecf2330d5733bf76706c8bcb000ad7a56368e20506ee592910546920e989b7c. 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/CH0011900370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26fded9303a313d671223a460b570f49aa82aec75190b1d883c56ccc60c8381. 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/CH0011900371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed105ca52275fec42105334254f9188807ddc762c61da8466934223bc08248d. 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/CH0011900372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d976013ba8df9ba34a3f9cde4b43cf01e9250f4627a1241391cb6546319ac95. 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/CH0011900373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27423f120a2acebe4850ca7365cc61299d42d9bd5bb1fadd55842550f37f514a. 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/CH0011900374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bfcbf2f6b4cbca91323f2bc99206eb2b1b609cfaa6a0852bc94252888b766f. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/CH0011900375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26fded9303a313d671223a460b570f49aa82aec75190b1d883c56ccc60c8381. 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/CH0011900371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35d1ca3c4312982d63480158396c2b5830a96857d1791ed2cbba3cb43de490b. 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/CH0011900366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecf2330d5733bf76706c8bcb000ad7a56368e20506ee592910546920e989b7c. 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/CH0011900370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b48ab3e66c88918a27ac39a061724f2d0f3b05fb539dbc19c1e2106a00d1e2b. 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/CHA141900064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901fed8501cc63d366ebbfc7e3c1553f5c05ced480adec79b160cfa1b6633845. 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/CH7812110163.