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 0x9a920b233fa3e754407a2cce237216c5c255625f6a64376ee6037fcb43856d0f. 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/dde22c56-06d8-4635-9019-67c86e1c5518.json and https://artists.proofprofile.net/proofs/artist/dde22c56-06d8-4635-9019-67c86e1c5518.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 0xb89087beffba84b4f847b8d27826767230f655380714f98130fd6aa1c7fca9a7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FXQ692100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16354705e545e55e582f1ef3afac72349590124cd4fc380931763f175d2c307. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CH6542163658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d472077cb54b93ab72631eafd5624eca4dcab924e41528ab6aa53264edd454. 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/FXQ692100377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe8fd001e8da8289b8180f0a89c19f29b010d5d1c9b50f646c412b62e60a613. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FXQ692100378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae81217ecb94f51e6cfe396ed5fd45990881fbd8e0ab6e546afdb544c822330d. 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/CH6542212673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90f2410ba7832173c2aa4205ff69df0d2c5bc0604fd354c222e260b67ca87f8. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/CH6542269075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc6014824e8f8ae7f1a5eb0a8514af73e8dfe9f3a9ab75209fa014d49149804. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/FRDX62208820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4917e97d8a39d6773db73f7faabe95b454dcbacbe4b0c8beabd86063123168f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CH6542305470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6577671ec8439a7ef5f175d481948e732823dfdf7e31edfafbe4bbc806b4853. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CH6542430377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e65d39dba73378912ec321847015dc9b9b233d927ce601b4f18a26e48c61ba. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CH6542430379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e02e190cdf2e4f5376f7da65457b3c35bc2d7223ac9f4b7d921482fd2fb636b. 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/DEH742418083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5cf56b27a44980b2eaaa4b0a40d754f1726ef2645833647eab71ed3ff743d9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6L2377511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647f80fbd01e2ed83449209c99a44b82e25bc09614f3dab196dd1e88b0ad18fd. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/FR10S2431372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46539f124799a5ce594112387c5a9e23d93a4d84600f63aa89ed3d11a64d8da4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA0H2479667.