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 0xcd842761645e04ebd1645a2d8465f6df91da360489c1da6d5358bd315170a27f. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7443282-4c47-4940-be73-6ffb8f1beab7.json and https://artists.proofprofile.net/proofs/artist/d7443282-4c47-4940-be73-6ffb8f1beab7.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 0x2532351a7168edad0a779296afb00322edc95ab3e41b92a765bf9eedbe9df2a3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ESA012512575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c36b8d4b27f7da60b3a157be70962ed394541f34b9cd1d521953eeae05b5bb. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ESA012512577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c54b375d08ee70754e8adb56cbcc1c7b92cad98063118166b1f803dfc3fa0a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ESA012512578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2643e392dae597934109d0b2f97c1e30d4f3e5ed135997e6d98c978978234387. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/ESA012512579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e40a01b7aeb7dd5c5b3752a2503c2d7d0c5ba1e5318ddc85d52742a59ce1e68. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ESA012512580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44b38165b81014ea1471ca7cead2c53e5651717a1b03d75138ac164ed1806bb. 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/ESA012512581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17cfd79f0ad656b20dd1f44fc9e5942e4fd09277e9d600d1e5ccf6402e631ddc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ESA012512582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11cfc75740cd586d3f98bd6f8dc0b369bf8dc3b603a72dc529441f337385cb5. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ESA012512583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad3fbcaeb385a2ab77948626c3a0b095d56632ca2cfe7b34ebe19c3f15af093. 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/ESA012512584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ecae035d7134dcca117c6a1d0a3e6d8fdf8e5b3df19dbbad45017743560af7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ESA012512585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b25ef23ae42dfbd5ecd42658a781aa75712c2cef6be862b4ec7a76fc1feb26. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ESA012512586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157a20f7543f71970bad88fc6b81d42bd554440238dd0bd1df5bf68bf58a1438. 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/ESA012512587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e733d9be9e69da118449bcda4a88c3879e18ea2cb5bb3db08867b6082254e9e. 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/ESA012512588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944bb666b94d028b23a9601487aabb467a5359baa9db7aa0bc6fc87c3703bba4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ESA012512589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7aa089271f8e0b38242a4a4c6779324de19ad46f452ccd26228ad7a765979c. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ESA012512590.