Semler is an occupational surname derived from the occupation of baker who bakes semmels, i.e., white bread rolls."Semler" Notable people with the surname include: Andrée Sfeir-Semler (born 1953), a
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 0xcb01e1cb7cdd50898a553d298ecca026c409001a67a2f72d4b7c432427e836da. 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/f841cb32-c0eb-47eb-958d-32efd1342574.json and https://artists.proofprofile.net/proofs/artist/f841cb32-c0eb-47eb-958d-32efd1342574.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 0xeb6be054059dc08473040c67ace25188ee3819fbc1fb9bd7a4b4d4e1a6385f84. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM81738248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834c4337c38b9463c7e6a1caebd71ccf94077506597f20c9258d7b971f137227. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/USCGJ1813210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563f8241a405c04d2c19e1f5f7d01532b70c3345fffc5d18442fa233d5b5921e. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMPKX1892810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a282422acca0351a5407faedd0218afbd83013695e91d76d4ca73bc493e80c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6M1916106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9017547d5d1410beb08e4156fae012315c4a7276d478195f4a65b1421a31ce. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZNWV2083667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a25ef326c2d306e43ccfed5f777668f3e037ff7e327b4b7bb3bdfc32cab5490. 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/QZFYZ2185601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20c55a6fc9f009a36181cbeceb06f4230c9c726ca7bb5bd658f039a0568bc4e. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZFYZ2185602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6380a6b3174099595c58c678b9513582b84ea80eff5bef0ac55c766c5eca66ef. 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/QZFYZ2185603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa849a3707d224d2974813674ad6e41d6a153f6e8f8d0e0c04e7e62561ef5300c. 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/QZFYZ2185605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae5f5197c4c38f3a8a082888172948b3330f4f1c11a6ad565dd45dd24841158. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:33:59Z), 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/QZES92166495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008336c583f080752df9c1743e0c4d234d90a2eb97ddc11e2841a341e0ea44da. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZES92166496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cb909baeebaa6ca5b52faa50ac17802e12fe36c30e578e5d24ef89a424043b. 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/QZNWS2116535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abd3bcc38e3963706a99ddeed8b48cc0e660f05cc2aff8b88bff22527bc4f07. 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/QZNWS2116536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d7e453fb7f697231bc9f54f2b68f37d9550ef3fda36cad0badd84ac8034aca. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:21:54Z), 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/QZNWS2116537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76aacf03bfd31c8ae6a2d24093abef2d7e2a504532718627fd05d45250933c6d. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZNWS2116538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefafe796b1e0ae6162db5047a7cc361bb0543d9b05ae856994f52c274980b36e. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZFZ62210706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e41824ae07bc147fb346cf8ee2fe7638a9bc9a336203be8c1fba351b744f4f. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZDA82224979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e41824ae07bc147fb346cf8ee2fe7638a9bc9a336203be8c1fba351b744f4f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:07:19Z), 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/QZDA82224979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8057dfe576909d699b1a381bb5f2ad005e36bc3b676fc8cae2f2731f03880320. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZDA82224980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c5e0c2bdbbde79517ac4cd4b509b672ed10d8b50aeaf8f487a8343bd9adf5b. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:49:19Z), 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/QZDA82224981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8930078842504319044a78e25ffac0d96395b3c1d5bd48d613bbdc9d2afb348. 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/QZHN92355879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfd5d9faa555069bb27df6c447cde6342647b4fe2e96ac1b4acc1085eaee730. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZK6L2359766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0185ae2bf8dcc1279c13ed7ef525ec42c7314ef433a1dab4cc84d2355ef839. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZPLS2320978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4708145e6df41b2d40c45bf75299ce9c048c3fea560393c69f94acc7de0c906b. 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/QZPLS2320980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ef2e497a5f814ed3afe57bd4a18695a0b08fc8735a03b07828adafd8f7f471. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTB32386802.