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 0x6bc4c7ace3ab47104af4fb5723ec44365b6b7014146533b32c5c583bcfc1b512. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bfe103b-2396-4a5a-b16b-554da17ae056.json and https://artists.proofprofile.net/proofs/artist/1bfe103b-2396-4a5a-b16b-554da17ae056.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 0xe6c7e90757611a56ab4cac9baac6f132b12ac052bcce46119b0d91bd1b736724. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USL4R1817030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf028fe2d9f5163a4a0a851b6bf85cc01af4744bab041bfe852f3ce8188dbb6c2. 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/QZ8LD1970639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2c62d00a2141603a2afda4fec803ed3cca30f070712cc2b9571a60c7d5c921. 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/QZDA61925671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe260d5c0f46896cb80d21a099866359b426706f1768732d1c23d993db6248f1e. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZES72220827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3283ee476ea872572c0c5841c5a985e56de5390774e631258948a0818257b416. 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/QZDA82394608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb213fb0954a119debb7b6a402cb20f1a109a9e3794c6574a4c40a9f4aeaed535. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6H2383662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45db69e22a66da2fcd348ea811b185f602492a9ac438c070162363cd16a3cf6. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFE2348507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370032299a2e8fd79de5d73116dc3413f8bb2df54bf4dc55809a4c6cad6beaaa. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFE2348511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5838e70e3c927a9c5eb11c2235c12039f89873ddf2f50d1d052bed84a7118e2d. 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/QZWFE2348515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7549a663ecf688a4503b378b0f1cd590a087ece215a6d30e1235b8fe4789c6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFE2348519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4032c7abd24008c6135def6ecae1247eab955132cff0484ffae6e0a0348fe246. 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/QT3F42443801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fb106e3d6cdb7a7f6e516c9e0d8deaeb4eb9a1f1009785ad7d59ddf77cfec1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QT3F42443803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b34c88108a6e4c6de135fa48c44b2f20fe72a789466d4162055831586a8ade. 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/QT3F42443805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4856e6a70022549b140c184b9d07bac8e291ffff6b3ea799dc348adf4a2c0f. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QT3F42443806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf63955e95c919db96a4eee08364192abae17ed3bb2f1bf816bb1b7f7a5d2e14. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QT3F42443817.