Da Vinci's Notebook (or simply DVN) was a comedic a cappella singing group. Former Artists-in-Residence at the John F. Kennedy Center for the Performing Arts, they performed specials on Comedy Central
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 0x11d558e85f03b136567cbf397eab8107cee746ce71859c811fdb6ceade695d5a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d96931e-d630-4e20-a7f5-abc80933ab22.json and https://artists.proofprofile.net/proofs/artist/0d96931e-d630-4e20-a7f5-abc80933ab22.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 0x2c275682062a6c62adb39408df115db5969d26f39422e38fc06f6c63d6258afd. 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/US4XR2154004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437b93a8eb8f03c1647af9287c1cfb111172eae4215530774334af130932b1f8. 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/US4XR2154005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f53ed874df8e013685b9e9fcd8f481812948589294b345d5d3c8033e50f5a3b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US4XR2154008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8936d3c5490c1b5895d3a4ce6ac3c26f8d26652234ff0f74870ad32a6b88d8bb. 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/US4XR2154011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe90053e32a1eb0d77562f113e22d29319c8e5b57419ec9be20fb79fcee1f3f. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/US4XR0654601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807b30a8e69af054a3f8d4e51b87010fc3af512d373aac82e2fade3d02c97ff4. 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/US4XR0654602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6533ad7d5a6120cfd0fb81281346700085940f02e80b5f22a89c4c8ff35fe448. 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/US4XR0654605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc63f55a25c58e2ce01ac90d1ec6ff2551cbc93b5c2a887daa913684c7e4dec. 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/US4XR0654609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae7cf5b5a23ee629a553577a0e9b20528474fe1fd5639527553d5970b8de768. Chain 2 (Bitcoin): anchored in block 957717 (2026-07-12T14:54:03Z), 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/US4XR0654503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72240464adcfe5b2d04bb5001691f684ea1a8e25ef9afca573eb668488fd0b50. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/US4XR0654508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b8e69559b9a4c9942837ed5de6049562a12e79f2d6a8253ce9c9334e712609. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/US4XR0654513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b7645a738746ade67ff24ffc328736e1793cf0bee2fdc02db0a2c9abae11bd. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T01:43:31Z), 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/US4XR0654514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fe7902b04a732eaef597a96141c0caebb12fd73495a1b8004c000de3bfff39. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:02:55Z), 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/US4XR0654515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cc5ed073e81930505a40ea7ab7bda43114b12e9c6c1968d375a3918fc48235. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T02:19:45Z), 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/US4XR0654517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07101bcc6eb96623befbf70d27121623ca8bd92ecb35b356f7800e5c66e86d59. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:55:51Z), 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/US4XR0654519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ac2cef825a7dadc78e8ca83319c3b5fbba381d0ab7eee1d30e1b10ce9a328a. 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/US4XR0654520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51152cc8b109099079f1efca4460610c74e9fc47961bfe12c326e10846185f34. 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/US4XR0654521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df6be58ac6b13b684c83ca96f3360203edd89ebbe65944263e4c76c7e3711ae. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USTC00924717.