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 0x957484baf37be1140b8e665c5ddab28757079052eae1dcb88a8c97224569a869. 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/0b18787b-bf2c-4da7-a34f-2385688c63f6.json and https://artists.proofprofile.net/proofs/artist/0b18787b-bf2c-4da7-a34f-2385688c63f6.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 0x9ab36aa7bb6650de37783c5b4b9fd053860d1b9bce6be12d6a323f6d6c7f54be. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/NLB030900551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9632be04ab5499b44d5bf68ff3a37151a2a96f584b1b8e7106732e31bc303817. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLB030900558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf514f736e231104bf120713f0222e34502bb0651f76f992a2d75c1fc88d05de2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLB039700060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8e04a35c570bf0244b48bf1c2f46183448b7fd17f8465307ed9383bc6f8aac. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NLB039700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe6ef2bd648380924d3110fead5049a6e7b12db9f3091e2201a931894da37d1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLB039900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6313aa994b7b0d7a2e105116b51bb17418e926700c63f557c2bf3cd69b3b0d4a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLB039900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2295314ba21cdc2f2cea425f7380beb2c03e1d40553b6fddec76b9fc80dd643. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLB039900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0441f7c2bfbb4cc10f9fcd2490091a9918f1e1e415aafab4ba6fb5bad9f8e51f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLB039900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3e7106c0fe3fea48794284d4b75c0de12d9adf1d1af4e2d3cc30998d2233e8. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/NLB039900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b242c92623940c3587a41b1012da7a23757db78bf85f24e2622d6835ba2ed8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLB039900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659eace4241330a99776992a416c6df932d63ae47f05d48acc56e23eb875d411. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLB030000124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae579333596a609d0a64cc74dda1c53bf14d4d194e26f963db21839edb320157. 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/NLB030000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29bb65164a8ced13ea46bc5a01f699542e5e5e0ce395f8f85f1932a55888667. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/NLB030300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3eaf62d6fb43273ee7c9362f7523e5641a14f3a7a86762e2244a3787912c45b. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLB031000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b79be3242aa309c64152c9dc5ee91995f47e90c1c8f8d76bbb71c7dd687f12e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLB032000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976668b0c703c79c3364621251f00f45eb94b84845779c0eee41826816dedb04. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLB032400020.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34d05ad7e709aa004bce7c7137e84d41ebb50c4bf70dd3813ee1ac14c05943c. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/NLB039900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5b4aad0fa958ee2f2725d395123496e50b642e6d3ecc6117ffbddba827ecff. 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/NLB039900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29bb65164a8ced13ea46bc5a01f699542e5e5e0ce395f8f85f1932a55888667. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLB030300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9632be04ab5499b44d5bf68ff3a37151a2a96f584b1b8e7106732e31bc303817. 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/NLB030900558.