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 0x0158d8f1f77805a4b4f0705bd9b1188f7d2878f21d8a6944669e5983c58c95e0. 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/d2438290-12e1-402f-beef-ea757d384668.json and https://artists.proofprofile.net/proofs/artist/d2438290-12e1-402f-beef-ea757d384668.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 0x20771bde64fb68992328ab4a33d7f96200266c5d9463a745dbc5a5484630b37d. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/GX89G2218186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915ed6def36c28dbe5e8bd3dcfe3493d7b6d5341578c04ad78ce48e845f32a29. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/GX89G2218188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d2959375dd9ac330dc9a09e7c4dbe80e3171fba7b7ceddbf2afe5c12533bcc. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/GX89G2218195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f513bc9cd7f7562392cf82ba7eaab6411670700578b005a89b9d1377d0a6bad. 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/GX3HH2203512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9f2f110ef728e4d1f6e0b11305be5230b1b4c3c7223ec703d83035dd390313. 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/GX3HH2203513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b95ccc028c88c0f7ed6448f6bd74c6bc7b855a614909a9419918914bcfd849. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GX4R52295351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf257983df9d35170b1b5b424d22aafeb54328ad60e92889558b87f70ecb4d5c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/GX4R52295353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad805b836e7cf97d7d12c82d374c6feedc9eb0f731fbc0d87679b8c6605f65ed. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/GX4R52295354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad57ac5d8035bafc5edc1fb0049a039595c89e3602f08bc8ab12e3d661c71db1. 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/GX4R52295355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5124a5f079738d40c7f23393d1bae073e24ae070b1fcea613ef86aa20d36d25. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GX4R52295359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce3e982a3b6995b2f3c9a2e93a6203aca4e9a428dff87ac63c28653bc2e84d0. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/GX38U2254563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8de224d3410388d827864ddc365a09a04671b5371bacae0657cd5af9670a76e. 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/GX38U2254564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001e84e44a0f962b374340455423ff813171df8692d7168905322cc7da80fa52. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/GX38U2254566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c866c0f875222d07640deaa66dd14046c3a23e095b7eb983a28f87943b10582. 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/GX38U2254574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07c193c8395edaa1a718bb2308c11d8c2f60598473312dc4565e3303284ec01. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USCGH2552516.