right|thumb|Reconstruction of Byzantion's Milion based on historic accounts and remaining fragments. The arched structure is approximately 14.6 m wide. thumb|200px|A fragment of the Milion has been re
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 0x517da3ca8a49b2421987fddd35569cddd53708eacb11418e64effe7a279fc034. 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/3fd67429-96b0-471d-9235-563b06ed3185.json and https://artists.proofprofile.net/proofs/artist/3fd67429-96b0-471d-9235-563b06ed3185.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 0x43a2e4848f958c31a8b471b713f2995aeecc615d5ee06bd036c78be29795423f. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:42:51Z), 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/GBKQU2150175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0d43816ec3e60e45b9bb12dd6dd8b45987da1720fdb041aad3709479ab40a3. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/GBKQU2150176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1d310bdd1fbd26e345b87823b8e2348d012eb99b29c9880a28511181972322. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GBJX33720170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d935473ee6f7e3302ac78f2bd3a073b6562595dcbd12618c20baf207cf05c6. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GBKQU2304435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a80a1ede19a2d70f9a2feb7e019cf49b106055b91f8bb5a0f610bcf864e589. 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/GBKQU2304436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8616791e511624bf16a93ee3628bdfa07bfe969950085fa70a6f3b98f8bca1db. 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/GBKQU2382661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f4e7bbac8ece301d9ba5e0af5ce552116aa53e1618f6756d13ac4d8a48d1f7. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBKQU2382662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28280060f332930457ea322f71fbfcf3e7de925f85be0d74e307c987a457f096. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBKQU2382664.
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 0x698417bb6c06dd437b061b1466c575f3d05a74a34781b8cabbd69724cfb7252a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/UKU932482857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82712cb3fb8055928f4e4db771a1f795357f40b64ac8aed3e245f140d097e0ea. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:43:38Z), 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/GBLV62410006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca62e8ba83ca2489cdfee917a3e9073f61d9784ec95b7700f62d0eb2632949eb. 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/GBLV62410007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190c3ea07a153f0b007683cf3862f29fff3327445f10a667ab16741a8c5611a9. 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/GBKQU2086676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca62e8ba83ca2489cdfee917a3e9073f61d9784ec95b7700f62d0eb2632949eb. 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/GBLV62410007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5f89582f715f229b2e99699fa6248f5fa7db0cc49722d50c0c5530dbff3e5b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBKQU2104624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d458e04e55fafcde7a4ba31226ba41f0f4714d3aac0562f2934f03ba316582c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBLV62030195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9584ab5c6505c8b83b34f0a26bbc3f15d884b1275ff9b5e6ac8e1eef5a60eb6e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBKQU2053704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9fcb18c13b04b06e182a86d0293d5f28eefa5c98d151ca65a2c2fb03238a30. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/GBKQU2467569.