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 0xdeaa57d24621038c50d0b2ef8922bf6ebde9d748c134f76029c331a31e507cca. 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/09d8e9e3-716f-4b8f-b69f-267dc2ba2397.json and https://artists.proofprofile.net/proofs/artist/09d8e9e3-716f-4b8f-b69f-267dc2ba2397.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x8842607ad19fb5301835d0db1f4973f95b636bf79821d60b82210903320f2631. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/BXQQG2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7855f2bfa06c33f2ad9619034ede66fd51f99e2921334da81781262ba19bceef. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/BXQQG2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70ecb8f3700d9a80fc5a4aef23aa3563921f037825e337d467061aa1a661e5b. 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/BXQQG2200031.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af82330d602362aa0b2dfb8ca6f3e05476900dae55df47f62e2378f2f84f416. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/BXQQG2400094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b534c10d9f3d8d48525ea925f01e870e342bf4e885146ac3708b5b654947fe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXQQG2400095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211f93f988b29b0a52db35e1743d61b1dce3e13c50bef66a5242ab7894ae1df5. 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/BX1JM2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ed0f0ce59ca22f66f7936700303ea6c61e6cea09d164394f9e046e3c3dadf4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BXQQG2500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29476ea3fcc0201452e05e26e214a5ff0bdb32517312758129b964ebf1fb072. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXG6R2400626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71743e606c4d68100521fe18cb1155008cd064f15c493996425846bd199fd235. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BX7DY2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14938b44cc1000efe70c2345b8c5b787ffea0052c82b178cf0a63bbd1086127. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BX7DY2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d8249e366f34771d1de8f73793393bf57653171a39a14e92b9d050236242c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BX7DY2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70e4c968e27fcee8049b49467d7ff48980dd12caaaca89ff1bc1d57d6e9bf8d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BX7DY2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139b4b9c10da6b1cd47e06ccca3a62ae5535d2dbc6d5f00beb669fa34debac1b. 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/BXIED2200018.