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 0x3941cae3a596599ded382752b50f4ed9940f1c9ca9fb35b5ac7e44bd3c402d14. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75b3f822-167c-46bf-bf02-c69f05f3de9a.json and https://artists.proofprofile.net/proofs/artist/75b3f822-167c-46bf-bf02-c69f05f3de9a.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 0x1fd9c8a2ccc2132abc8628e6c7c28a716547cd80377420ef0a0e8c9705648a9a. 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/GBLFP2381140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e010eae24e754312fb1abcca69da296053b94a08ab5d5679214010fb403e2f7. 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/UKXN22480097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b25d024164b5817d58fe58672e75c8496512a3eaa0e4c37ba67d1435343be61. 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/UKXN22480098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09120c6c9fbd893c16f0a7fe1da39a2aaec63906adbb7ebe2d937a6d8af57e33. 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/GBMA22343462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc087a7d88a704f9d2d955c0fb6e515393e0301904c5cf12574375e9baeeebbd. 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/GBLFP2284287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c18a511c4f400c1231cb9a35923dd16aa9471f88a128602d52f247cd9a3c095. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/UKXN22480093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed124882ccc69b7f51ccb0a195ea46e243e9e18347c6954bce6975bd5c9e376. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/UKXN22480094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ce2b9d34775f92c6a1ebed4eed921ff2cee6179855ad4efe9d0911c2f8c440. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/GBLFP2304135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac12401ee77d27baa2dd275836a2836d02b9cc6cd9cc8ff0291b02187278cd3. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKXN22480095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b5b29464facb553a8c79c2696d2280506e8f6fe927e3f2090268e08e28d826. 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/UKXN22480096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09120c6c9fbd893c16f0a7fe1da39a2aaec63906adbb7ebe2d937a6d8af57e33. 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/GBMA22343462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd9c8a2ccc2132abc8628e6c7c28a716547cd80377420ef0a0e8c9705648a9a. 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/GBLFP2381140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ce2b9d34775f92c6a1ebed4eed921ff2cee6179855ad4efe9d0911c2f8c440. 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/GBLFP2304135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f8263bfb22673b9e9e4219d938962dbe8a2d28a73b07447a1afb2f2659dcde. 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/UKXN21958498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7cfb6136a218adb9c31a153613bbe2c9bf30512ffc1f7041af97ce73abebfd. 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/UKXN21958502.