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 0x05b2d7f7631d7c42fdb2506e7de69ad2e2a0c7a033059f1466ddd02f677db923. 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/27d64947-3242-4ade-8fb0-fb1c03630b3f.json and https://artists.proofprofile.net/proofs/artist/27d64947-3242-4ade-8fb0-fb1c03630b3f.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 0x288909d9cca22844dee8591a3afd8f2880f85f3111f01b604bebca222663a80b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZDA52397965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca65d2be5cd0366fad1607dd68ceb96bf7d743f0858f34634cc124c84d08a81. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZES62361860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed6da5e9a409e99a4203ff99dc44d06d219e2b7c6c9e0db88d93803a3b7058c. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZES62361862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d69adcddcba7e7a5b5463e84815729ffa880816584c342f8295d8365ae0403. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZES62361865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a98760c7b04d6c516b97537f1bcee046a6e70a3a147dcc89c70143c78b7ce6. 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/QZES62361863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55398f298430a40147170d86dfde0d53f19cbb1047a4ab661c5ed2193d53f37. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES62361864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fd49f1c7822e7fb716011809b9a1fa669af20bc8b28eba6411f9265fe6cb20. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZES62361868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4498298e7a842aec2e27646a84a6b902697271c371d432542d01f9cbfec44f33. 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/QZPLS2302573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264512c7c85fc388a83c172115334f14b1aebed98ebd69c086820ca53f0bbff9. 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/QZWFL2457937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e12fc0580fdd09235e549bc8d5d66d6fa2d900040f5058c95a6724771570836. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFX2464529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcc02183a8a2b86bf3aebe3d1c62d68c652fe171a1af7d8a1f0a27e2846f7cd. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZWFX2464530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b30e865e826182d838a9a4022a9c5678211ffc52beb3cbf03223fd6d5b9472. 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/QZWFX2464531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba64b39b594e8d09e61ce4ad8ea21b5bdb6480e597fb78adeeb5fd4482f02b41. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZWFX2464532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69d6eebbf211ec4fbdbcebf554f6517e237df2f8f64dea4c11197caeaa2b66f. 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/QZWFX2464533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b059922869019702a511d04d0ab485a51a14147dec93292d2bafdcb3feeffb. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZWFX2464536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9808254fb9fbb4c3342ad3cc49e9204f7cd6720c0bf213b19da69cb095b58e9a. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/USLD91775231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89ff6fb5c1d8c5afbca695d17b4fadb3ae0b30dd00b3bb1d64242568e2f34c2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/USLD91775232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f323284c71de7314fb7dc5c617a49b41e039ba6f8ea2d93ae39686ca8c47ad. 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/USLD91777146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38c85241203aed1bdb7f5f0512ac266a1bf8aa61d10a71983a81e25dc940e52. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/USLD91777147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a1dadb51d2f209e0adaeb422cf6bfb12d9739e7eaf4804fbaed9bcde62cfe0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USLD91780560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d2e57d23ab3c15152e5dfe22de10420b04b506c9dd48a38a2208c1c47dc90e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USLD91780561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950f302bf08e33902b09b7261bf25eaaa2d851f48c059a0aabad7b2a5e4264ca. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USDY42435353.