thumb|The Code Of Honor—A Duel in the Bois De Boulogne, Near Paris, wood-engraving after Godefroy Durand, Harper's Weekly (January 1875) A duel is an arranged engagement in combat between two people
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 0x9c4d7c628fc8d8105ea481783701a4a086fe26c568e496083e1bc3134d5ae98f. 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/f01b60fb-a0d1-4c0a-85d5-b3756ae5f7da.json and https://artists.proofprofile.net/proofs/artist/f01b60fb-a0d1-4c0a-85d5-b3756ae5f7da.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 0x9facb1c10a0ed24b0ead06f042cdb6f876dfb1370b28dc6c6e4177ebec7e3beb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAIK2479530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c84ba0d6ff6561ec64703c7e904f01c3fb54a2a93b033ada6a7816e0bab0986. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIL2479667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3f6df2fb05b31bbc652574e713181f96ff3f3157c10f65e6c796e4418ca05d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIK2479718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e70f1cfac7de229c9801a9cad3df0a4a07ce92f22f9b875e69023498dd9c7d3. 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/TCAIK2479724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069a967c5769849832a343691a30762ab735375652351441a3d4bec312258e76. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:55:24Z), 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/TCAFT2120491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019db81e595dd0a6649d3c15ae5352ca5ee7ef59048252f99a1c704923bfc1f7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAFT2120494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4ed7c0449acc45ca6a6be3d430b832a2a22d9b5e99b7ab923c4cb72602f781. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAFR2184818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdc6851ca16466d134f9e3093887bc15daf6fe7bc36a92287270b4b32f6a6ff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEE1927421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4c360efa36cb7c0c1fca8b01b85f7a0fd7fb1f27a98b8657561e01e396f9ba. 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/TCAEE1927430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5511a959c4adf918f76caad2a5e8d8b032918d8efce9073091a3c9208c3cf2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAEE1927434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d07a8c89b35a8caec9d960f80f5b4a802be7c63c0930d5bfbfe0db3ca58f11. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEE1927449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3c89235a465fe81ec550616daaf966b613019d46770562cf7aed1000ed838c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACY1737602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745afce1979a2ddfcc0a9518c1b2997de1865b87f04f6e39484acab8fd197f3a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACY1741089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca48f9232df0c893832d741064040c7f7fce4398bc78555a4023c58245564ff3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCACL1636541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1ab5c6f9b4976ebe7b668f10ec13c6c3848fc15578375af226dfe471b38411. 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/TCACL1636550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7214964b998b08f64007790540aec5bd9692eeb0038efc61e4ef3bb86a4543. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCACL1636553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4fe339b3f60537f3bff51ea4ab960df5498ab16a4c5c6f87bb725fbc5a8153. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACL1636558.