thumb | right | alt=Ulla Lenze's autograph (German writer) | Ulla Lenze's autograph (German writer) Ulla is a given name. It is short for Ursula in German-speaking countries and Ulrika/Ulrikke in Sca
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 0x143fdbf0db8015fd720cec672a1dc7de2a6d3d0bf52e97e3af9b367be949ccc8. 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/982ef3b9-4de2-4439-8dd4-1515d0202d8f.json and https://artists.proofprofile.net/proofs/artist/982ef3b9-4de2-4439-8dd4-1515d0202d8f.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 0x10f153342897ab972252964351b44fcd84e852f047486dcfae94724f85603143. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/AUPQ00700547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215abbd993904ea097891b32e331eace5054f959fc09b20f5ac5e3e03c6c76e6. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:27:59Z), 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/UK8261901047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf806bbbdf320fac2ee1b591e38a3b9934ee2cc81deb72d97b3ace1c51345806c. 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/UK8261901048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02af51288937be5c833459736768a1fc14125c8f124298b3572f4e5ebabc4a8b. 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/UK8261901049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04e73ff4abc02c53dcec11a0d81ac39f070f26899bb739695dc69f09f562d26. 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/UK8261901051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87ce6cb6de4c507bcf69591f7ede851c54038cda36b1a6a954130d92ec5374a. 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/UK8261901052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8c7f61a16bfd87484fb3959a0a34d572e4038244dedfd02b66bda920e0cd43. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/UK8261901053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9bbd1a2d8c9d0823c476823b61a73e75367cee33f9031412e6f0069e601d11. 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/UK8261901054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8229ed7da61790c5c6d03cd948318c2cb498d67d025390004c5c1359d72ba3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:51:13Z), 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/UK8261901055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd302c164b188b01381905b04ccf8aeb17698ca2952d0f7589d4ac2f258cb7f1f. 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/UK8261901056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50e365725a3c0503e1eb2082b3f9b2ae5ce0a166d5142a828bf51a51f1ffa03. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:56:12Z), 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/UK8261901057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed615e925ae604e016d38744e2c7c14709703fc2526d5c8ec9883b564f858778. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/UK8261901058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecd55025c4b927c59041d1f68206e8184ce589d52a3216ea0304fedde5b91a3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UK8261901059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c9e5b574dc55463414e2468008e1ac2a01dfbd782f010259b7803a577bbb03. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/UK8261901060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc696fc6106ae757acc96b6a2e4a876211c5c65f2c1ea3793269e113131537c2f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QM6MZ2418346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf9f8f017f68cd48450ca42fe83fa409fa0ef375b237ca38ec15448acdc9071. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QM6MZ2418347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5117b382e736ff399466416a8dfdcc22838330f5952c3db2c78b66d6f8150cc8. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T08:31:05Z), 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/QM6MZ2418348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53d2944efb9e8d874685aea5551c85d9a4afc6df0f425978fe8d5c54d4965b4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM6MZ2418349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d790beba40855440af8b80ba8c6ad150ca5de03eb2de98077bc0f05638d1fcb. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QM6MZ2418350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f01595a722aca4735b51b3e988e189ded534d27ca4233660cfa08fb9647c3a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM6MZ2418351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2dde5362dd2ea0659e8fa55384fdbcb11ac8436ddfdc0cbec76ac6e4aad780. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QM6MZ2418352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fabf7db2c42a10ac77f1718cad203692228e1146528da2264b97482592f4fa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEX262100825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e0b457b33922924736866db646315f06d90ca2a8b1527a6d8a28d9960c93a0. 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/DEX262100826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fd10d862594427bd202c8e061cd8efe42628ca441dcdae75803aa65051a6d1. 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/DEX262100827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929c0cfecdd1aac24cf36727a7d7738d8f371748df8ffa7451ef91b3e24bf005. 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/DEG932404309.