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 0x39c06f48b869ae7ad701d154002b493757574320939a48b75d43450ccf87c98d. 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/a2669b56-8716-494a-90ce-933c45abfa2d.json and https://artists.proofprofile.net/proofs/artist/a2669b56-8716-494a-90ce-933c45abfa2d.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 0xa84443d40b02d0f0348060d8dc9fc2a36e0f8f4b583b2c0de2c1afb50fa1f66a. 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/US92U1031001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b112ef45d2d1c8d2bc97e2a6154621682e707ffd32e1a1371870ac9c68970f. 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/USLD90807894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdec65f7a7c6103cd2e3804f7e5500c10ebde1637719637d21136cdb35faf6ea. 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/USLD90807895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108f977e5fa0ee0b9a6e2a85338b10c5b01ddce515e4d9a8f66da8bf26fe281a. 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/USLD90807896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd044298a4f0099e3fff23a04a2605d7d0e79089ad03d9baa273190908425085. 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/QMBZ92455556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384f1b412552273891cb488b70aa6d8f0b4c91975d085ca15e9ddf6171e82e8c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:25:47Z), 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/QMBZ92455557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d58a723a2f772029780d84e54f764ede27e9459cd181b8a4151ec29a05b6c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMBZ92455559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381dc114df29889ad1a4370a350f8568ce37a7b192e96b6d500a5d2e5695762d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QMBZ92455560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312bc7e621fe95b31de351d0f8b8b91fa60d134d9efc50711cc964c7a3ea2bb9. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QMBZ92455561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f297dd40cfac6b525c37e6c138e6ab70b2f850b05da6dc43eddd94a56a4fd0. 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/QMBZ92455562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f1accdd1135d85878c50997853072286b679b63606340806d9850ec5ecc52c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMBZ92455563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d39f607aff2cbca0349a2fa29d2162ea66c92891dab8be2c9a79c770176c9e9. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QMBZ92455564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f224cb3a2d048fe3013f8bb78eddc0baae0e2d5f25ff7bee1a11f576cf41928. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QMBZ92455565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c40ae3b44480f4088e27256a3a539138042064af566c7776db2972ef95da889. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T05:02:39Z), 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/QMBZ92455567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4844632d4d3809bc78d482c370e94c6fd374b5006be23236e4b22ee871095d82. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QMBZ92455571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a81a9cd85dab239ed4dd6e360a69b036924af840f20adc1eb0fcecc0486e290. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMBZ92455572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1482916694fc57f973bc9de6825627dccf64e51a77629ce2368f00e9ecf0099c. 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/QM4TX1559278.