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 0xd5f32fc1841992a2b6509b20baf5308eaf51bf8e64785e51498e855ba7da2a70. 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/8e57ccff-9931-4e65-9cbe-8ff267f26de3.json and https://artists.proofprofile.net/proofs/artist/8e57ccff-9931-4e65-9cbe-8ff267f26de3.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 0xd63a38dbaacb6b0f0fbd469536a5ddd08dd08ff52004a6212d7682e3f661cdc5. 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/USDBB0991024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4256361fad7a6d68bdf9b2cb67ef63863ba162af173f874e631bba6a565a95. 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/QMYW20800705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaffba16457df51c900f26c39fbff097f99b2352d3a5458df5e2c55794905f3a. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QMYW20800706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28daf0902ea95960209411332276a8efc5ce84c0e51e9406597a29a202441ea1. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QMYW20800707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40be7b4664d0361b1c4a6d030fedc3e8b7ce2bf9c62f9c33b808d39d8a68034d. 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/QMYW20800709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db078c8557a5f027eeeaceaaea2f3f222d9d3d71e7e3d8ea7668e40eba418d0. 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/QMYW20800711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9976919f01d9e5605376093ec8525157943541306554ebcbd134d16da47b656. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QMYW20800735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59397d9a8d93e3b1cc82aa626bb8e14f2b2be6eb098c6cb02ebcf508909cbad2. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QMYW20400605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf128dd9f31508a5304487540da559864fb4e5b2da731c573fc067e3dbfa361ad. 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/QMYW20400606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b018013d8e090798ff4e6b7e9f02d9d8438a94a4e6959c9db5c1951163372c5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMYW20400608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36a3a776a1f8d791846c4263cbf4200b58733e05bc0ae4577b3da59c9fe0ef4. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QMYW20400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee49e264b1094237cfce543bdec6f2638ad785b46eff62171ad3533e60d5d38. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/US78T0507117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c8b1154044927f03a6464cbfa9cfafb8602f0cc7f21420e2e13dc5105cafef. 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/US78T0507119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664431259893a419a5cb27f25675a4e5934de38c536f851fb77edc5c00c9101b. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/US78T0507120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeed45e79ad0284c914b6461da1c6dab66f2b70b47a1731eb07295950c3eece2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TW2455517.