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 0x1500750979dc345040f80d843691a9e76ee2c3ac51475712c4a2a372ff9a40c0. 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/3afc9804-8b7e-4fe7-9a09-b82bbdd7c6c2.json and https://artists.proofprofile.net/proofs/artist/3afc9804-8b7e-4fe7-9a09-b82bbdd7c6c2.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 0x10930a21e31b92bf45e9064019b65c689d9bbc9e7c2b8cd64a65ceaaa037eb36. 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/QZHMP2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ba401ede1ee6339efebd8398283d55732328c7f28609bbbd0da66d0b371e01. 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/QZHMP2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a30f48834e3a77700035da0c01fef7fe0fa94cc7818fe5d4c09943f136e3b. 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/QZHMP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa809d89bf3961649b1768de63ff4a2ecf9de1103364820fc46af095d0b7cade4. 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/QZHMP1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d6c17c37ab5bc8601fba2de505a67f3680aae2af7b565bc39d351f4f010189. 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/QZHMP2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ab03bbbeb2d0eaf2e651a87e4f92961ec8b83d639a6fe8046a83aa86c97609. 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/QMBSD1800060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7a6c0f2a8013391873b09f627ac4410b291b97b2f88aa9dd33ce0d2197d085. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QMBSD1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d3cbbbeeba37c3963645a6d33e4d63ce321d3454e72482d8befb02ed07a1eb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHMP2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe257480a4d86c53d298caa8ba35f33418c71531459384733f321d9b80856514d. 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/QZHMP2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e399fd028b17de382987e3b9ebc1529179cedb937c86af282024d59f821876b. 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/QZHMP2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10930a21e31b92bf45e9064019b65c689d9bbc9e7c2b8cd64a65ceaaa037eb36. 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/QZHMP2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ba401ede1ee6339efebd8398283d55732328c7f28609bbbd0da66d0b371e01. 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/QZHMP2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe257480a4d86c53d298caa8ba35f33418c71531459384733f321d9b80856514d. 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/QZHMP2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a30f48834e3a77700035da0c01fef7fe0fa94cc7818fe5d4c09943f136e3b. 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/QZHMP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7a6c0f2a8013391873b09f627ac4410b291b97b2f88aa9dd33ce0d2197d085. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMBSD1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73002cf4fcc595ca9983164531a2ae75a1c684872930d2883f91f765ce0a42b8. 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/QMBSD1600231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd728af1b437e4fd4628301e5e6a3246bbb2b3a897917a5641793ec90a2b6f78a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMBSD1600232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893753bf688f96c17968c7b465cc47f9e06e13cca0c2ae3200b4c1ef7fa3f925. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QMBSD1600233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73410d2e36a8d008e4b5750d679b9a6e8c8405bce0b2ff5819b5635a154b07e8. 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/QMBSD1600234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ad6a14fc189e21d89137ed3df4e46c378923fe905fb06966bf38a8228d7160. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QMBSD1600235.