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 0x64e69fbb7a04369c6cbafc28d64098f2f91e006e6a505bf4f8d678e5bf036cc0. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5af88a45-ac09-41e0-a590-5e77fdce5ad7.json and https://artists.proofprofile.net/proofs/artist/5af88a45-ac09-41e0-a590-5e77fdce5ad7.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 0x4de9245ef5d89173152eb4b97838ed27bfc5ea7399f253f263d814e928e2061e. 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/NLFD30820001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f47639ec21d188e76d62c10dd6e1d8e57642fb33ccc6a5118cf02c58170b273. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLFD30820002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fde4221201231331ee0df6d07efdf9a5352094113816d35442a409c58a17db. 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/NLFD30820003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9a37a8cb91c433c6b34f955efc71e1d20e7db7aaebfb03c427d945de92a233. 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/NLFD30820004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c014a356eb4122ac177a7bf162401d004ba68392b8333720937824ed8d2580. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLFD30820005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc957ef78977116f13253378d46c897bc163eebc3c593515aee366a1f036dd35c. 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/NLFD30820006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406229c7a4b6861cfdbf9eed62e6b306c55949175c467e8bf7d1901899f6491c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/NLFD30820007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba3562114f0813c1140e80836b02bf1d48464c6774cbf4857b71f037e9f602d. 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/NLFD30820008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e8570c55bb1137970f734b8ea9e89acd0dee0310abf9485fd0256ce4f33962. 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/NLFD30820009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ca194411163078f9458e7b450b19bf99cbe20166a1c94b41cd96ee27c3fd17. 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/NLFD30820010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c27fe3e1a3fd5b0255db036d4ed52255c37423c79e325ccf63b0dc36b012ec. 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/NLFD30820011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42648c78ff7cae045ef15aa4ba1f54540b8ca131be33c2b27bd69e89e219af9. 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/NLFD30820012.
Amy Sorinio, Vol. 3: Knockin' on Heavens Door