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 0xf73a2cf443d92c8d6854dd0e21440fb3963d33463bf3038fc4db5d1899a2e344. 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/3056cc14-fb4b-4f5b-aa89-0a21f03213f2.json and https://artists.proofprofile.net/proofs/artist/3056cc14-fb4b-4f5b-aa89-0a21f03213f2.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 0xfa2f300813456a412da1bdcb44d7647662a40aead210a05858bbe79933fd62c1. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/NOCVS2108052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7745bef3ab7d5fbeffa675e497006ceea76b986157c2376324823d55501ecd4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOCVS2108054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7a57ce55cf3caf98ba9d637bce0c8911f825f0df16cd2c75a06b0531ca6bfb. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOCVS2108055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafad142debb24c62641f1694cbcc9cb909a1e277b1dc49058ba869df3032d03. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/NOCVS2108059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0392c9890d1403a182f2c9f31d2b3d63cf3e5b2adc7bd6b1c71f6fc294d02ea. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NOCVS2108061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c81e1801ec5f6af7888344e571fdc869d95e9366d30e231e6c963668d095d9. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOCVS2108066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eff7e6c51f25b29fcb88c8c7e195ac83a632af39941b2c55818db9cf0d07ca7. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/NOCVS2108067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc3e41dcaaf31a7170597641d20594d30d663487f08c6f2c3a1a452edaceb1f. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NOCVS2108068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf27c952050714dda8ea137d3cec1678011ed63038ee86624a3c7213d3fb69e2. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/NOCVS2108071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508d02e4e1ba3c04e03a2946b0b73623b08f41011271f6c24fb25f56d0d8f437. 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/NOCVS2108076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5834e0d56295f5957201c5ea833ced500edc1bd163c2a944bd6243faa14cbdf. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOCVS2108077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724dacc776504d0010e5ec8e7884d8b43525fadbba897a5891504f62aa8b0756. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/NOCVS2108078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb27503e7fe5b2a6765f784a2b62bdc3137ae8c6967b166d8054fbaaecdfe59. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOCVS2108079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0860dd044a98332b39c1e0cf779a0802d739797dda05376c3e883ddce1d684f9. 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/NOCVS2108080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98441a56a952546c5df052aaccd7b3b7f4002e97fc44ad563798dad8d84065e. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/NOCVS2108083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b94d84893eac0ac5bc6643ec029e34a77cba4f66d353152de0427e6b1f49c05. 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/NOCVS2108084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4195b75bd38bee4f1f4ea8f88f2e513d3e84312b3aa1d2e47dd9e0c8c3e316d0. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NOCVS2108088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68d438bac405cca6a15f21ecc18012519fa5ef853b45dd761328ba4e992f930. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NOCVS2108089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f413824f6946d9be0acd0b16f067254f46e2ef31d2ca149892e9ccd427a90df. 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/NOCVS2108091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f5a23c7bd499ea74422338913fa99273c2b8d86335f03fdda695c1b5c3e41c. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NOCVS2108092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff4f2956f2dbd2e97f0fcffcc461aed7a5116ef319691ec07ac2f30d9e0f86a. 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/NOCVS2108094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235bc3d40c2070d4a6508b87fa851243b4bdf83c68b6c7b70df0ada2d65967c8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NOCVS2108095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9828f6939e1e092b45a91aecc89cf011f9b3b04e6eef6ed672cbc3e05fc0971a. 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/NOCVS2108098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0fea6309c24ac4ccd7669510efa7ce76fbbb2471d32f4531ec79dfb6b6a93c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOCVS2108099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94032dcb08a5cdcb751446bdce6912d5a29b5a00a9450edd2d57e308d3b07bf7. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/NOCVS2108359.