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 0x93bbdfbdda444bf0c9fa8c841740b4788435a95776a899bf2b1b34f57751ed99. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7c5ce5b-9b5a-4e18-83d8-d05934fa1baa.json and https://artists.proofprofile.net/proofs/artist/d7c5ce5b-9b5a-4e18-83d8-d05934fa1baa.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 0x9b1d91508ee411f3bea12db373c286a1cfdf9851f0ceff60456a07d42c734bf4. 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/QZGWX2204723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa39655d98962391fa6f5d1c33495259c0f0043186fc77945a8c0101f75afbf. 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/QZGWX2204726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe277bc24da8ab39135d16b580ebea3b41e63b7c1aeb808a47575157af6411c93. 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/QZGWX2204732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6458365dd1d95e7439da9ae77cccd1b34edc4bd8ea5183681f3207cee27a8abf. 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/QZGWX2204735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67d434da88927e55038865ec3473e05ef4f6284351671c955127f0911b3c259. 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/QZGWX2204737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc2112649c7ea9679986326e11b2bc18ff1a98943ee1bb30e5c5a4372126cd8. 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/QZGWX2204740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a16cbc38a366015abd40bf754ef333b5acd446c1e602678fc1ce481c40f2336. 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/QZGWX2204745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea66cbca2c38089d7a6a9fe0edff7950b883a82ed5d6178b85b749a07b99090. 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/QZGWX2204748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16567d40a527812167ba2d7207cb269cb02d1462ab124066efc40c8734c0ecba. 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/QZGWX2204750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9633d268902c22c046cc08d390fcee68d8c1f0b975acd65eff12286995fbe681. 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/QZGWX2116381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ae57325824aa8adac21ec78bb1bf3ff8e31f7d7459c9dd8e2b982c477c4623. 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/QZGWX2116382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27455e9b6a42f57ef0f3504ce70719b70beffc95a89af8c5ab5625ba94c9c89b. 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/QZGWX2116383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ad9e0fc8786808f6197f99ee361a8a7744ce7c7a0f09e3148247f9512fedcc. 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/QZGWX2116384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d911035a7317920c7d28f466e1c365470489a959acdfbc31a3b874dcaf4e9a. 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/QZGWX2116385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b22b86186aa889384801aa72a46239e00b45f6bc6fa57ff38724611f738c029. 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/QZGWX2116396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97c739395040425c44d6bfa49d3a4c2f001f24f359a7399eed246efd20e1cc7. 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/QZGWX2116398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe514534a8927f7f411b295f841067397e089a3f7a6ffa7bd127059ff3476f311. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:25:38Z), 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/QZGWX2116401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf772e01dfe76e9c250c3efcae9b47dd8b2d3020e9fc9689bbedc2a15c2adcd. 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/QZGWX2116403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28585fd2ad6b0f13263bac3ffca6088e4c4e158b346fc7e5c18f07434e854a7. 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/QZGWX2116406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e9569afeac27f020e771ef409316b19b1b86a76a1466fc305ec2bfc516cac2. 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/QZGWX2116407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4acb99011b7f99e88c83a58ad885850e45bd3220939a48183f0a853e8c763ff. 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/QZGWX2175661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf640fb2a932bb9cfb64af6335b407b41967be6237568723cff7847c5f5cdf69. 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/QZGWX2175666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce0b373db3f9b7d7e784aa395a449328413583dd4df89e32cd13f8fe6891a35. 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/QZGWX2175669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffa963339e431d94018da9a81fd103f864ead1f289b65151692d2fc771057f0. 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/QZGWX2175681.