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 0xc26219f28722d643cfc3aef583e0501920b7211263aa79e34f109eaad7d3c91d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/619861ec-be57-4885-9476-694c9725a0b2.json and https://artists.proofprofile.net/proofs/artist/619861ec-be57-4885-9476-694c9725a0b2.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 0x27ab93fc880a6f005ff38aa337267ecadf69e57cade3eada3e237f816b56784f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKG732103050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bad8a5d1384553904273dbedcf2d246a36ef7fbf70f3df5f0a9a047cd58170. 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/HKG732106739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7145bf0bb73e64d11f89a3b4c5269d0ccfe8122b23fe2110f21f9c6491d232ef. 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/HKG732106740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd96660c2397fc8820ed7fac2d64e58975dc0086d5c58e470d713ce9911f14ba. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKG732106741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9ba5bdd9bcfa766ed92d5dd905942f6bd623875bb17dbf085a931ab00290f4. 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/HKG732106742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc4aebeaac19f95358e679d65d9cb1311c83e7b2814b40b214f28ab608646c0. 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/HKG732106743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8de856f995e35f3a8ad7d09e9c9e8500be77a9277a0967fdf0f44ce52ea8d9. 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/HKG732106744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56f289f864a7add7dbd5a2e77aabc818a87e4d0c9a16c7a527636d8ea2e4f7e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732106745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556918d8c0e8c2fb63095d8d671e035444dbb24cd43bbe1da426b4c8de35b802. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKG732106746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a3343ae51c83820621e609e394eb3142c87d51bc26e86cf58f521241117192. 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/HKG732106747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8e73d863034baddb322474ccab97e66ac3a5981955c867201e47bda1d2dd66. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG732106748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a0b07a4a97656caf649af41fccccf92d574d27344338c99dd923a79df014df. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKG732028973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42ded8f24a06dcff54e816f09ba8f18d06a2f4ef3ef8f1bc608cdb59e0175f4. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/HKG732527513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5a1c898e41d1976c0c10cc25e97eda3d152e96dece8663e375f2186ca2596c. 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/HKG732505159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1574048b7aecc65c0c36b3dd2f2c5dcba6a3ca15c8eab50531d73846cbbd37. 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/HKG732508104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110652eb9baac37e9c6d8acb240876d03c4e0b1c6daae58999cce735ed5c38d7. 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/HKG732508107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8411b29ab2787792688579e6c67288bf7261c1c269dd5973c485125d2388af2. 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/HKG732508108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b508ad959688803d6c822c8792675753cf9614c18f5936c649c4afd73bf4ca4. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/HKG732508110.