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 0x2996b9820bc5bea088a48d757c10da12789626ad8890711a2bad079094b886c5. 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/f067e48c-0200-481e-9be3-541a58c76cf6.json and https://artists.proofprofile.net/proofs/artist/f067e48c-0200-481e-9be3-541a58c76cf6.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 0x12e3abc1762aa0743abf7d1804d72c07f6b3ff733cd5a1e013d3b4b5773f2da4. 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/US7VG2210534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121c470e6a344272cfea90a7786a2f317377842887892cb32c6e19be2ea58664. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US7VG2210535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd748d4efbbf4b9302221779e1245c299b15cc3c80e10389cda1f7130ebca11a5. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US7VG2210537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb2534440b9239e4ed08f7a18292277ee4d4d1f4a5ed6f0c1d6f0d9a38e6ea0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/US7VG2210540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a00eaa4c01a265fb36de55c97026de02f0a8a9e6e7a3125576232a19bae8d2a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/US7VG2210542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50650d39a6f15c4f006bcdade860b5c2d31784854953e3cf58515b3bcb527b9. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/US7VG2210543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427d1fd345f3a7967c389d9375967012fd3539e5ed672d7a12943ceda3b5bd38. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/US7VG2210544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6d625096ddcf52b09e5f72122b6f714f33f04ffbf2aac939ac2c8539a6256e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/US7VG2210545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc050dd3444bcc0e227eb63a9d752cd540a2dcbf5b6efe2420ec373cd6566343. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/US7VG2210547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69617f3c5709ef1ecf1c3c9ab8908c5782e999892a659729ee99fa25753a3a3. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/US7VG2210548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eaac605fe5f5203ea9edfb2774a5bef91c745f8d7a45edb6832b3079d2e7189. 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/US7VG2210549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf400f26fb75f3c47335cb6c56ad441988439a0df593085bf3a0d8f56dcd74382. 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/US7VG2210551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894d43effe7adcfbbb0843a25f7895060f892e1e717e2cbfed82457c30ba78bd. 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/US7VG2215540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2d84579ef12e6d5f3760aac655fe8713f02774c5863a5c9a0940e06630f1c2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/US7VG2215541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092c84275d7bcc0bb6de80e0f32477413bc59d572a61833c47501d776321d9c0. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/US7VG2215542.