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 0x45553c483af40a67af2a5d60c773d4996c2cafb0b25f743659822f6f1041f04e. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f326c315-c011-483c-ada8-09dcdf846b4b.json and https://artists.proofprofile.net/proofs/artist/f326c315-c011-483c-ada8-09dcdf846b4b.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 0xedc3de1d800b92070602a562c9156a2f113ae3bbcdcb0ccfd64de919ac0908b9. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZMEN2441716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972755399d4dedca09388dc87c800b18633f1443f95c3a87ba06f26cb9c9d012. 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/QZMEN2489652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732b8c5bed2f6390bbe366acbaa582bb2f4d2f954e0c4e021cd1222e0f0e197e. 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/QZNWS2440588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa9d25030c1818a013417d2666c6c7fd365cb8f4f28dcfcca801803f6c8391c. 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/QZNWU2406365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc4bbb6c4a0e5e85da9aa225a31a09790fdebc0132d77a2549d9158d587bb04. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZNWV2432467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbc5da24e7d0aa306895d612a01dc5478b9962f9ac42ecf439e287c4e8ffb7d. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZNWY2401707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf753c9a23b636270182a48680a889ba8a09ea51b65b42e890ed4f37ec1d217. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZPLR2416834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb246c06b3f53a56cd1c416e4bdad885ac27ea6b88f54eca878aa06a37107c03. 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/QZTB42410380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c76d071e523b86d5b7a089d58cdc5247e762e6615d4537a9db819b07b3e596d. 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/QZTB42410381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ca035aea6a39352ebcd59d68b246845514d58f91ff4bc15aa1819e5e26b558. 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/QZTB42410383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182f3485e17273e3267ba35b9bbc0160192641adb2074bada8833a8e8f74bb29. 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/QZTB72442709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7fd37e75d6a64b2cb363f7f58288b0e95d7f6efe359039d3d061bf195c2696. 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/QZWFP2414305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fed94e5e6695725a2f070cfb8d93fb9c21f61f3cebbc2556e25470a6f814d62. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ7S2498185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1ea84d5a74d9d38c3a34c576aafce72455bd652d0e917da7d91cc2cca801a2. 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/QT3EX2488866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a786463b69f916a41d90279cc93a30ec0cce2efd4aecabee15fe7127917da8. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES62543179.