thumb|right|upright=1.3|French royalist rebels preparing an ambush during the War in the Vendée (The Ambush by Évariste Carpentier, 1889) thumb|General Braddock's troops ambushed and decimated by the
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 0xb3a41d0b977f0fd08c3da4b59921701ffc7b0eae1df3d8aa6053225acf8ae0a6. 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/8eae2921-526f-4114-b43f-efa1417be98f.json and https://artists.proofprofile.net/proofs/artist/8eae2921-526f-4114-b43f-efa1417be98f.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 0xdb034823e69b264bf48677618afdea2906d38931034a6a86c84a7df63ab0ab18. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/DEQN41400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00a3a8b08bcf12678dfa3eb50417ef8dfe5d8d1babe8262ccfdba0308614c92. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:01:51Z), 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/DEQN41400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b94e4c73edeec72896ac2eb765df24148f43102e1c4c4a0c1c4056c20dc9f7. 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/DEQN41400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe751e53cd6ad5c032825bd3eb6a4d3910f5c0d76cc809e057ac84d7ff8342b29. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEQN41400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb920be5e8ebd78571677fad51f650b5ef1fd9f3a2a8730dc5437365e488a15. 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/DEQN41500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1fffedf4f86d10f8b8e61e3df69b8556fa352a1ec295f8d1a81874b75d8d10. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:20:16Z), 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/DEQN41500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b8101c05ce0057b3a4043b84225dbbc84fdd56b8d11ae6b87e21d842197fbb. 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/DEQN41500078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8da22ce6eab12c84a5e41e10e0ede02120987059dde117e390b6a5f708de520. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/DEQN41900097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465fc9fdd980af1637d98cee33a0c72abb27b6c29fc4731de5dd0dfab8a0f32. 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/DEQN42000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dccef1cdc0d8a489003191e81d593096a22ff4969cb726200eeafca1d7bba1b. 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/DEQN42000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465fc9fdd980af1637d98cee33a0c72abb27b6c29fc4731de5dd0dfab8a0f32. 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/DEQN42000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906352dc8b03e677adb20f28a88b7b9b67a5cceebbbbf1395fb22b9c84e1d98d. 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/DEQN42000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7d565eea432e93fad1de9206faf02d56cb7acc423accc06cafa3a53024cde1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEQN42000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eff062f256f96892cbfa7ce029ed7055594a0fc182b35e11791ca8db61b3a55. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/DEQN42000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a1788eb7efcd81935603596d0c36d354459385af9d1876b1a92869f5f9f1ab. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ATN262537102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8f20cdbcb375acf5bc68341bcb8d6c039c3cbe57c2b27fd655623e81199faf. 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/ATN262537101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14be3ea3741f59f2540944f5e2e8608070f55d1ebe1cc9a74f5bd39551164f6. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/ATN262537105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb387025b5f01765d22122c77f21edcd369101fdebf987a1d3617fc6827c583e7. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/ATN262537106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a1788eb7efcd81935603596d0c36d354459385af9d1876b1a92869f5f9f1ab. 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/ATN262537102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8f20cdbcb375acf5bc68341bcb8d6c039c3cbe57c2b27fd655623e81199faf. 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/ATN262537101.