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 0x16c63990992d1b1d587f44d6e18332c6fd232636c5548d6246d48534a72fd9fb. 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/111b3894-08bd-42ab-be0a-b56c3fa3587a.json and https://artists.proofprofile.net/proofs/artist/111b3894-08bd-42ab-be0a-b56c3fa3587a.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 0xaaa064ec166c5e947745d523408e0c068ed13616a235801aa3f622fd26affbb2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ62359421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2375f9d6d6f603d026157c77da73c2e65f57324f4f045fea87abfea6c8121f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZDA62398367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f7d71cc9208c8beb0d74a3f629cfe38288bbc9aa6f1ce627804a01cd553140. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZES72317361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e702896d0c3c876df66bf3d9bbd4ea44a5d3711abaf2c694409313b04ec365. 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/QZK6F2353841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30377acba31081e9089ca99c637379ceda8b412b091d8fc47630682de0932537. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAW2373525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f823c170371abb4c2dcabf13bda0fad9c25bb57bd85addcd7b53162d780a782. 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/QZTB22392832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae3eed36ffa7059f52f9a6fd2f0e0adbfddb144cb6cd05a1c4f6a077e10636d. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/NOPTR2402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008c6e70cc79a4fb1b53c11ff2aaddd1c8b5ca538a30e86958e1725326ce18cc. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZFZ62499076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36043352fe3ae23ce33b50b38342d3b3694d757bc79dd7b2f4819c4a3446b45. 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/QZHN42403426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48018c8be8217e2fd23fa4ba400ab86a540c6bd724ae45089844e7c238b364e4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMEQ2480226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d36c222ee663dc62c547113aa3df9a77773e71153630d8e8b763239bee3617. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTB22489930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655a46a6acecf7a19167091464505a08bafbc33c8ae217a18425a4de47d79c78. 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/USANG2484000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bad8032cbbef7e50e71626936fc616c3616b21d86904bf184029a6c79e4112a. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHNC2500206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aba0dd36643660ed7fb2b415aa93cd0533f23c481eae1803d2a85f71df36aa. 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/QZNWS2483105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9181ea411461b6759b507a83402701842c3bf588000fdbe9bd777cbf15494291. 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/QZNWS2483127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301f78bd3f43631546857cbd57df0d065953b5cfc33dce6a8d4859023db1626e. 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/QZES62421340.