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 0x28d856201ea940d5893b3a3affd6583112ad0ebf4140e1209ae0c729251310ac. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96439a5f-4716-4a87-a8ba-3264a959f3d2.json and https://artists.proofprofile.net/proofs/artist/96439a5f-4716-4a87-a8ba-3264a959f3d2.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 0x7d9361db86f0b0ea3eb8fd9e65667c4b504d34945fad2f6394829039a5b0784f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBC3S2231007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0379cc90a8021fa77c558a05f6f4783f5d3e7301a527edecac09ce63a13786. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBC3S2231009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53245d995bf4b344f3822f378d18429731df560be8f184e76fc7b74eb9b0ccc. 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/GBC3S2231011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdfa5e9c737bb074b65ce4ecd3015d564d0ec71ee7592816bf33b0e29efff31. 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/GBC3S2231013.
Cheryl Frances-Hoad: The Whole Earth Dances
A Winter Breviary: Choral Works for Christmas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12e5de111bbb130a6c6550afbc3052202decea25db3d16977ecf80fa1a78c16. 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/GBC3S2332803.
A Winter Breviary: II. The Year's Midnight
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d913f1e9a99871a38fdbc8b8181db55d0d8322f135a2e572a0a5a7071fea30. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBC3S2332804.
A Winter Breviary: III. The Unexpected Early Hour
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd194e0780a46f3e02feb03ae97cfff8ce607f4c97d33d08cdfba1316dfcdd157. 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/GBC3S2332805.
The Christmas Life: I. The Christmas Life
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98630b8cee2e1fb430328df5ece0b9aef59a98b325495246dd09dcc12135491. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBC3S2332811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689a6719c0a2e3d451c4f7f7a28c33282f4f18f25329921e80be181f103a4aed. 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/GBC3S2332817.
The Great Glad Tidings Tell, Carols from Copley Square
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e37db001fecee8e6661c1d17cc83003232609a7e9c81586a269171c6ee16bdf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/US3EU2401601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8594f9b164984beb828762f6534e72ca1aa774133d6235b4201c23521ed6dc4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US3EU2401602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0223567b98b584d66c6fdf764f9bb3a79ef9c077b96509b6164cf13b45ef3ea. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US3EU2401608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a07693a11a84444562ba9717198635b39f25b4728fae78acd35d5660515abd0. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US3EU2401618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73474a16959dd462d90c4584edeb20dc4c98966e7e889d0dd5945d5a782f729. 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/GBXUX2324906.