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 0x332f6a94f81f676f90d38b66737824d43a248b507414a0a10308f3b07ff796b8. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbda5c57-c5bb-4de6-85e8-dd5dafe34cad.json and https://artists.proofprofile.net/proofs/artist/fbda5c57-c5bb-4de6-85e8-dd5dafe34cad.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 0x2027da6cdf7163c115ae41b7ca1271a7975a6452da3687f5704cb23812c36b19. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/USA371140657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea81cdf39c6799789259a0bc279d03e0aff1e4349fc24ea33752a11b9704851. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/USA371140660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f589c06c7bb47466ee8920b3575c326fec2e633ddff2b82cf060080e352497. 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/USA561123464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbb2fb435e8c630fa7145bb1aa5b7faa20005079aff18d690b1ed6e7605fc4c. 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/USA561123465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c74cd908e90742416016425ac777c33496aed0c24fec72586ae66260feecf4. 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/USA561123466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf6afc3ee6a1b834dab36aea99580279e4b51c659359ed5be66f89c0866ce87. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USA561123467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d8a426c63bcf3ccea977db2f73f5c84b5b0afc371601561914776f27be940b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USA561123468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fab7eb5c700c1b7c88317505cce4b083e522e798e0c05464ceee2a5dc011f33. 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/USA561123469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0d1ab6c30c21ba1829a945151e8d4c2c4866c761d56efc9411c38f837edf86. 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/USA561123470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b444b878a792f9b42a9fca7470d61c20ac7300f084c9800c1a590780d7c2409. 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/USA561123471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03c6a9459b35849fcdd8adbb840f41e7c46c22d73fe4c3001bfe303a013efb5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA561123472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9105a6d88693455c115e670c28e37b97f9c2d083ecf0a8e0d63df7eb927a827. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USA561123473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ead9fe7801de0f0d274e345703481d319b92c92f091f60d3716ae93e9cd4a8e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA561123475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536be8337f3a44bbcf84c4ad2494c2214a79ca43b9a599b0faa7040577d56e56. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USA561123476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3842170623613c938d2e754c74b61c3ce70cc1a1c04b1d576ecef0d40cf058e1. 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/USA561123479.