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 0x5a276b7c9aceb8b0ec96cb1bd4bce80f34ab9b7ec72d5ccb64f380d4fc6ce5a6. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1fac928-af39-4e67-aefb-7d8abcfc7762.json and https://artists.proofprofile.net/proofs/artist/b1fac928-af39-4e67-aefb-7d8abcfc7762.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Durufle, M.: Requiem / Mass, "Cum Jubilo" / Notre Pere (Voices of Asension Chorus)
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 0x81ac0f8fe0c7cba55f2d23e39a296bd3028ee21a7b7db218f57fc9ea2767cc14. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USASX0616901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0119b0f5d72e18939c75e2c13b355e2d8e3f9e1b9d5a5d87f138fb54678894bc. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USASX0616902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc334ff9781d5b068f4f79a86f1f37c8f0b12c815c23f5ae3250d3df231f021a4. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/USASX0616909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74766bd8c2cd5305f4d0c68cf221515006845e4b53c50cee40808d9f2c5888fb. 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/USASX0616915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55873fa395f542aebbed48bcc99aed6226b2d4432d3b966330bfc914cbabc7b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USASX0616907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bad45722f42c11224fa2ca80f896e0eb455fa01ed6dfa7141fbf1a87e0bb28f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USASX0616903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd159dd569d420e054516362b258e7c3501477d062e2cf6a7af733a48898ec44b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USASX0616904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422946f430343a66ba9357b57b7b6422058f40ec0c2999fa3f3ebdf520f9cfb6. 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/USASX0616905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae78ce83e77228170924abe7c4bf2e01968a3b0e2ba761c0e4168b020267b784. 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/USASX0616906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dccc7fa83a393fa18594f12dbccd0458cc63b7ced164f63d74c84542cf64062. 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/USASX0616908.