The Klezmatics are an American klezmer music group based in New York City, who have achieved fame singing in several languages, most notably mixing older Yiddish tunes with other types of more contemp
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7aa0f88ca27adcb4c0cd67d863a8b28d0e8ce1b6a7989bea866f2ba093cf10e. 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/c792be4e-1bb6-4c6e-8be9-5cb3c54e1908.json and https://artists.proofprofile.net/proofs/artist/c792be4e-1bb6-4c6e-8be9-5cb3c54e1908.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1241c1faab39cdee264c74904d4e02d58db10a777616e39d762ceecad7b47049. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T15:55:43Z), 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/DEL129906201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708e1d4c23deec8091f1aeb4f517ec7d16c64ece8f5504e271a9b6c528c31d6d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEL128902002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdde5ded5d3702d316b13979924fe069928d71a76332e76dcbc5889c6dd47e9f. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:16:09Z), 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/DEL128902006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828a1b781d3bd1d318504bab109d52d1f725f47d0e72461aa683469df77920cb. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/DEL129403501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97eacdcba14faa8f3adc40834a267ed2dc29882472a7e3a217cde681571c356a. 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/DEL129403504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc8ce5e8bf96674f6aa51dc657ea07e3cf435d5ae60a192aef2a4036540cbcd. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/DEL129403505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00bcd057f421f4c08299a48e359ffba49f22e3f8a89ed4e444a57bb4e736b89. 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/DEL129403510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b8edc4617c0db2e4ca266526074651a0cb5d96f04d3a7e8bdcd78cce31f719. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/DEL129704802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0334b81c1c5c1faa3d938d433e6fae9894358b371777a1d89b057f32ceddab. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/NLB360901203.
Woody Guthrie's Happy Joyous Hanukkah (2025 Remastered & Extended Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833175ff376b75d3175093f780336935b068760d3a0e9d7da22b916c3f99a147. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEL129102502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027220309ade236ded8dd547de34e2edd604cd463baba0a12c59438698d77ec0. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/GBNTD0603102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd5b0a5859c1b71deb76833639c8ec474dffe9039463f28c86c6da86797f0de. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GBNTD0603103.
Hanukkah Tree (Live at the 92nd Street Y, NYC, 2003)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f0f443a47e55f7f3848418a92dd0ac418294d553e3cd5b64e16411e0067ed. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEL122507401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3525eb2e425be3482f04fda75aa92414ab99527977a0626b8c8305414154ea9c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:41:09Z), 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/DEL122507402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d7ab37625146e716132e83e07b554eea8501d9b1256962c10ab0bcc91725b3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/IL1011126961.
Ikh Shtey Unter A Bokserboym - I Stand Beneath a Carob Tree
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b4c911f5a5c3664a1257b52cf480d8b3fa3a89cd35b26c6bb1b6e3e50dad79. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/IL1011126962.
Ergets Shtil/Baym Taykh - Softly Somewhere/At The River
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d3683c20379bf4830dc06c80bd44aaec13bcf108af809cc87e29cb32719ed1. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/IL1011126963.
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 0xc4dd03b5b30f438aea19f964a3f770dbf96b8f2d39a65a8459d819251826ee96. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBAYC1501759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7593f6b7fe364d90183d532240503b56b8c5f0c2955f76b0c0294dc38f5bba2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAYC1501762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ecf0dd9707ce587923b9223124981360fe630c47831731a40616425c3d8a37. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GBAYC1501766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e2a721339e6700fb03cfbc8528d92c08c480554a643a32646d5a01ff5b005b. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBAYC1501780.
Processional - Klezmer Suite - Ale Brider
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f05e6aaba68c93957edde3c7843152a07e9631afe9538a801850c3f34cbba49. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAYC1501790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45788e9839e48bbce4f21c7aac090d520daaccdde8b25f811c9afee0df4f90d2. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/IL1011126964.