thumb|Klaf - a parchment with an ink and quill Klaf or Qelaf () is the designation given a particular piece of skin. The Talmudic definition includes both the form of the skin and the way it is proce
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 0x15c62c9762fd1d1c5756b3c9b4806ab40efd499f1245b561e523032e1a2af580. 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/5da81375-2535-44b2-b1f3-dd87f70078ca.json and https://artists.proofprofile.net/proofs/artist/5da81375-2535-44b2-b1f3-dd87f70078ca.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 0x5e1b6d92b70237f16deca948cd1a63f8cc2f8d463bdd4d78ebf26f5d14cbe4c2. 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/BRTRB2070924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3692d64adf620e131ae4a2df2c34ff5e704b2777eb5363f53644f4f5bdd487. 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/QZNJY2143992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abfaea5c5322e1b7f02fd02a4a9c7757bcc53b2433bb725b0547b0a85e70586. 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/QZNJY2143995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58be7f152a8d5b3e4cefa8af377ad65c7a89b5e98307ef5dcade3c4f45bd6a6. 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/BC15S2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe9559cd60b3703eda84ca1500fe9ae36b096d63d5254d4aadad57fc2117104. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/BC15S2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fcc1d2a1ce1f7f54a29e5b9fe44bee39bcdcd77234a8309473f8bf323c0fa07. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/BC15S2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae633a54c5b8211f9dc91ee2b5b38e4eb93e777fa49d357fe251321e089c8e5. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:37:36Z), 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/BC15S2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d161176f5ae916e200b824cf3acfaf8076d72c4ca8c58679a4a6761734bab4. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:56:18Z), 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/BC15S2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb995ad774c05692488478417e5c9cfd8685b1ac16271369a5c4c7eb2e39801d5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BC15S2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bab6676f2de8e62e1a3369245b6e13e30f92569252c3d144668f69283097f2. 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/BC15S2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfc2b9de4ff08cb8ea8781c6af576edb821b80ce91a5b5199a14ae65a1977eb. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/BC15S2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216aa60b053714d27e7146f8df7e247a04ba4de92760fdf6912aafb8685785a9. 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/BC15S2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3537f745329a890bfa512e400e56f9494b7294f9893f7a0b203b84a1c8e1dc. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/BC15S2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0899df22e59ce26864ad144ce918070146e4cc2be00191c1e2c6a1a81709c39. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:44:14Z), 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/BC15S2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff77ba47bd8f8632638f091ab3d6c1fd2197100f1b92eaa25f2405cdb0ce0b7. 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/BC15S2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f7a0c532d79184824a65e68c3562d57c4f221d53308a7c7a56616862f26df5. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/BC15S2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e851a1f9d4a2d94a29a2af53df5dc7aea8feafc236a3056e9433162342ae16. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/BC15S2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400cf7803e283882441d0490e489fe81b190b63484a9a67b171f4d911383f5b7. 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/BC15S2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40976b548a0f12648906565896a1412c81e3156b5ae6fc73f8306533988e7d4c. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:19:18Z), 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/BC15S2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecd3d5786a59f2f2168f7ca5d1427df3ddd255211509b5238b9f48f0d0f183b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/BC15S2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410ac5e702f9381f47a7da6870bcc2ae0f18b73f2ccf574f14757a64c41da439. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/BC15S2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08489911566939abbfc8812346fb199060ea1760069beb988486b0f541b73cbf. 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/BC15S2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34668f79c6d4e055e37612f6676ab9b5b27abc9ff6414e76ee4642888367cd0a. 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/BC15S2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc68d71159a0c6d2b177004662cffa259e7b5c2e472c7cd14df67225ee2a262. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:45:01Z), 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/BC15S2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043e64f431b1466856b0f4fb93237a84bb19bd4098ce5bb5259ebe040f8148c7. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/BRTRB2408000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5259e60588ddc5d1dfeef35c0be39dd1710e9bb898608b7732f186e451fe4677. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/BC15S2500008.