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 0xf612389b8b4937f5b1d8e7ba8fbe8765c754414fc9ca2c4d5af1e68ef40a0e01. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a536139b-b15b-4055-892c-028948f8fd5a.json and https://artists.proofprofile.net/proofs/artist/a536139b-b15b-4055-892c-028948f8fd5a.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 0x2412e99145e04020fb7981a251e3f5154f3c2383c03a675c64bacc097861716c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJV2550936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4ffb6fe562dc8eea53838a1defa4642d79c95f321edf4bc2776334fa9d3664. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/PLC062394815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8de59a48cf93d13927c9b3689128070b73582f64aa0d13bfdb0d2481092e36. 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/PLC062379562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccc7351e2d319770fd470a07da3ea7fa31b467b9277c0877edd89bc6f07dc42. 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/PLC062379563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59eb497c59ddc4db70889d6a5af725b77b400bbf8ad50c0820067046514ea822. 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/PLC062379564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55f16106de7ebe28164447799dc8ad83277906c8872196a7348bea18807f4ac. 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/PLC062379566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419045a536bba67752874da92861aaac641db3f1c86dbe154cc6be382f05546f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PLC062379567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826eccedd57eb3c1158382f1bf34a7b1dc6b44be27afc533421993841b7dfddb. 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/PLC062379570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18318d7fca4001c2d01adeed53f1ce9f3f7f892937098cbd7d53fbb85f73ccd2. 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/DGA052475692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe15078e06c80bc1861f8ced308d6124bc411609c483b6e55b5b1040ccf016dd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLC062379575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b895ce7fa311143cc3c67e0abbcbb31270e6a6c941d1685191575be46d665aa. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLR862400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca74ee094e261ae13d194aa951751d65712a299ca4fcd93aa7ea9fbe0ba53ff4. 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/PLA552500089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53971a415c39567ca87870b84edf608061cd7e21ec4618d4d6b374214b1b20b. 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/PLC062385410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01780081e25ae4935a39bf0771f4f77ca789c73c7c10252fc5e17a130f769c8e. 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/PL2DY2301395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4772e9f4c2248f2726b59e8b4c6bf5c7d1d1b6fe5573ff56eb6a98e8195e24. 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/PL2DY2301750.