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
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9facb1c10a0ed24b0ead06f042cdb6f876dfb1370b28dc6c6e4177ebec7e3beb. 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/TCAIK2479530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd30553199caf10602e097e21e648c8e021841befad226a5c94112ad7b5d784. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAIC2431374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b305f712528be44ee7b90837a8842dc4e148381367d186f2a705eff4702d1d0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAID2404302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c84ba0d6ff6561ec64703c7e904f01c3fb54a2a93b033ada6a7816e0bab0986. 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/TCAIL2479667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795a798a3f38a52243bff3d459af2175c3e1ac1d392913cb26972a83b76f3a35. 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/TCAII2444377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca26901b1b0c9885f68f8f31d43e5c0dfd85027d377b38a53ca84c2abb4eba4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAIK2479713.
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 959146 (2026-07-22T15:41:47Z), 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/TCAIK2479724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49da0c9545fd3026ca4d415a22f22d7bbcd36c7263916b0d354c770fbe077bbd. 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/TCAFQ2142538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc2fcf9e5bc886395e5a6d2e5d7f3ae6cebb87fdb9d1f87eb3ad6d031ce8d5c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFQ2167565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019db81e595dd0a6649d3c15ae5352ca5ee7ef59048252f99a1c704923bfc1f7. 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/TCAFT2120494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4ed7c0449acc45ca6a6be3d430b832a2a22d9b5e99b7ab923c4cb72602f781. 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/TCAFR2184818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162a956be6048884a0150187d2cdf0c2d0871e5583cfc8b1d5a95cb75d2b5398. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAFT2120503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb77dec7075983739202b043e8b7474163813472745c3a7aac3e3233eed79a7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFT2120505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110715d780a359580b701cbbaf1329259e25a8cd53818e761843fa0ccf572930. 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/TCAFT2120507.
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 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 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/TCAEE1927434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ba70df1121cd6f95b64cd00c2dd2fc12652641399c0801ebb52895120a58ed. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/TCAEE1927443.
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 0x25cf6e222ea50f7b227748664036f188f1ca0c6b8c446331ea526e58d10424f0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACY1737598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3c89235a465fe81ec550616daaf966b613019d46770562cf7aed1000ed838c. 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/TCACY1737602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda11dbff1880d177c61f99ab5cbdbf4cbbae2f12dd57128ae9ceabd07b4d794e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCACY1741084.
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c4b8b5915a0daf4c2c43f27bc17ff8e08127ee6e64b710d7644c0ae778fd1b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCACL1636560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab59a7c54e74f9bcdce62ab2e1e2adc374459ac805bbf13027203776d0969583. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACL1636564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795a798a3f38a52243bff3d459af2175c3e1ac1d392913cb26972a83b76f3a35. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAII2444377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b305f712528be44ee7b90837a8842dc4e148381367d186f2a705eff4702d1d0. 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/TCAID2404302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd30553199caf10602e097e21e648c8e021841befad226a5c94112ad7b5d784. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAIC2431374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49da0c9545fd3026ca4d415a22f22d7bbcd36c7263916b0d354c770fbe077bbd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAFQ2142538.