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 0xe5d2e89f8b176684f6382d27c87e21dde2142d03948020d2eae185626b052820. 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/2a68749d-49e9-43bb-8267-fe21a6023859.json and https://artists.proofprofile.net/proofs/artist/2a68749d-49e9-43bb-8267-fe21a6023859.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 0x8a7811f709d1474193dc2b2b0e828ecd1ee7a9d648203f208dc3c20d5f29e508. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QMPKX1515156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3a336f1df5eebc0c144379fe4f8dca9f2f3a5a91146ff116bb208311bf692d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMPKX1515157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4d3982418119c831458cbd72c76bec87255a24a035988423f8a765e345b65f. 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/QMPKX1515160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aa85af7eae05f2c5dd30e33aed9e202cf9f3e550af357827285590c573431e. 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/QM4DW1690637.
Lena Stoehrfaktor und das Rattenkabinett
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fea599527cb4bda81208684ac3581548af34dbb42ad03bcf281b8f1e6f87c5. 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/QZB4J1846550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893fc164ec20007f318f3d34f089474efae7887d4cc1f2d00fa86f4838e4459b. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZB4J1846553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20012d845da3346bf12df1f619ffb0e884eabe603289ca20bc64b2437a151165. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ71990832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf3e8b464698af4ca7858ea72fb9afb46157734837459a212dee8dfae44a8bd. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN32209485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd83cd4e92129595ad3b69c45b8b0b4900a57b415cfa2bbdc31edd7c04364f52. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZHN32209486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c806af0acd31265508b3c47a036b94b6232988e8308bd248dbfcc396c3c5b6a. 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/QZHN32209487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4964d6c35a2e9ec95ccb0dd653561ee1d7a6b67cb16bb2615e236d5e30b5bf8. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHN32209488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b38f10ffc105cc80e128127076ca347290d2b0734c623b4508b52e7f61f59d0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZNWS2473961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3332607bdd1283216e78b5482bdf62285c579c933b8a6f7e53cab0bb875368af. 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/QZWFK2447958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc819927dcc77e5d79d37ee277bf8031a369ef3b0921ab6d3d65eba1cfbe0bd5. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/CH7812424898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d044b52363d22136c9f850381c0b2170373f97770b406ec730c7ca0068c39d4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CH7812424897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc819927dcc77e5d79d37ee277bf8031a369ef3b0921ab6d3d65eba1cfbe0bd5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CH7812424898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b8d8da36ed24bfd4fcfa2af05cc2038ceb975cfde2fc5f5fc490332555f860. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:09:05Z), 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/CH7812424899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb392a8e2edfc404cef45f98dab66e165a50ec3d6432b0a0c270939e2b773bd6d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CH7812424321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5cc7c26e5dee223c55b85e1e81ae490b966053e5e751322b81c8c717e704ab. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CH7812424902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740e66c6d688e6889bea3727a08ad515c367c46b9d960f980bc1dbbc1589f214. 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/CH7812424903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7268c672c565bf3cb9f51bb18f79aece9bc41b0f9a162bf0d3693fed0ce01c92. 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/CH7812424904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85a6579ad3f5c27f495336d9fcd3f9e48deff1c227c1d83c543c6c37f32bc88. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/CH7812424905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c662cc2a173193b7ceb6c329462dbfbf78714cf07e8c2a6464fd2cf51b0a50. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CH7812424906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3363ed3ab6f531d1e2ab40aac016036ef339937e7feb4000e9107f265f37e280. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CH7812424907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917fef4abd6c1afac3bda1a5bbdc98843a8e262c4c54107fb1a83e23928c474e. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/CH7812424908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a01ed4167e0e58ae24499db333dabc79d82d07fcb7d5d429d52bf92bb84f9e. 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/DEZC62258452.