Instant Classic is an American barbershop quartet from Indianapolis, Indiana, comprising David Zimmerman, Theo Hicks, Kohl Kitzmiller and Kyle Kitzmiller. It won the 2015 International Quartet Champi
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 0x806f9fa543c5f52695ef2b0f58c00584813f2fa0260149d9035772849eaf24ad. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37bff67e-ce0c-4ecb-87d8-900bace57c37.json and https://artists.proofprofile.net/proofs/artist/37bff67e-ce0c-4ecb-87d8-900bace57c37.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 0x56ba533394e2d6c6a2cb87d66f6e5f58b914af37e17c49d67cff0399f4fc8d53. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/TCACI1524447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bea79f9c22d91c019010f79e4b0237f0375b90506daaad2ff672ba0b7ce76c7. 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/TCACI1524448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ce5a3a5c1fd43c827fb75eb25226de7c897eed1c93f5c1312f154181dbed8d. 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/TCACI1524449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9106936c993559919f86e27fe4587c86db574cc49cce5f9ce34bd91fca7c7a6a. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCACI1524450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b46dfa7e95ebdcf760d3e9ad2d482e99715580d449881e69b58455820609036. 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/TCACI1524451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b852dde0f50ff5aa6775508e1d24e6f0c13ec367bc74e7f6fdc0d4c15b9c5cf. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCACI1524452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a877cb00a07735e3f3947fa564e8dfe084ca1d11756508a54c5e980fa752e9. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/TCACI1524458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf626fdd463dd684ddb65ecf0718997db16fdca1dd79534a45ae9b427d49589ee. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/TCACI1524462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cc6e9b5cde3c9974be88a2a64674cf2ac1f1044f780ff55420d6275de7f4b0. 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/TCACI1524464.
This Could Be the Start of Something Big
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e034d1b432199cc7aa7f0be35179d419180ee659576d0e8ab6852747f52841a. 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/TCADD1710290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cf35b1ed8e5650ff0e9779cf6fdf95516f13b21bca659d9a2b808405b05cd1. 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/TCADD1710291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e4527b87630644c6a2f0c17e420c492b2ddc694b6903cc7b9566687a4f10c8. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:57:00Z), 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/TCADD1710293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69742caa01796d8317260026b66d81f568dbf1c29a6d10e2c169cb52f39971bd. 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/TCADD1710294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f93391ac85914299945ce8e8ccc514d2fbe07ed294017779e28dfbf51af39b. 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/TCADD1710312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1651bfec394f7d27386df7c6b0a24323263c51b86d25922c927be9ff833e7c9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEO1971686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0719de463e68680c180499d2ec803c6ec4ad0be25f24c3490c7862971afe8904. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:11:17Z), 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/TCAEO1971694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1e2ba85cd2bd6b4f44bec909b9a75a6be9ceb0e87f3c9c6f66de1a3faf0ef1. 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/TCAEO1971698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90327936c4644abc79cd686a2a1572b4891a2e99d7f19a48b37c3ece01a4e12a. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAEO1971700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab973e54ffe11dc787c438a66a97d21388b9584ae69414ced536e3f85238da75. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:25:15Z), 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/TCAEO1971707.