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 0xee69b03bd353db30e1ce30a8056ee3c23818c5fdc7f5df7c26618e43568cb568. 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/0d3f0b80-52a7-42a0-b8f3-3c1b17fb27e6.json and https://artists.proofprofile.net/proofs/artist/0d3f0b80-52a7-42a0-b8f3-3c1b17fb27e6.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 0x84cd3a2ccbdf3ec5ae2e11a7b963eb8e81f1bb16bd638eb20572969904db0e95. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/BGZ411800246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66832632a32a47167b7de861dbea613f5b5197beeaa9ba6dedd0a66b86d3b889. 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/BGZ411800131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9e6bfe3a45c7d9f95f10bb0cb8ae7364cf52b09313a69ec995faade3e5f28f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/BGZ411800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4d1687e13d22c67bf8da658e79b3cd09c2722afeabcff9343e4a5125263ba8. 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/BGZ411800232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60455f0172892110fc8d1c1f723c668e318014daaf32e758a9a5a05241b9db9b. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/BGZ411802051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e128d3ca590ad351578b30e8dd95ebb8db8654e4156ec2bcc0b737d8d0f1b80. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/BGA412100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1694a45b362b11bc107a203cf479c2e9f82d16c5217e8b137cab4bc0b313a2. 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/BGA412100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23af6023caac3e17402c1b0776018a426cdb7a56f286be797e98d7fe8ed81be. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/BGA412100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa061bfda0e3bb8d00953283ec8d16d87776585b9fceae8484fa7f4a8aa17b6. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/BGA412200085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88dab2c75ba3adf49ec66c071c4037d79d3c94378db340fdfca57dd8a916844. 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/BGA412300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23af6023caac3e17402c1b0776018a426cdb7a56f286be797e98d7fe8ed81be. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/BGA412100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e128d3ca590ad351578b30e8dd95ebb8db8654e4156ec2bcc0b737d8d0f1b80. 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/BGA412100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef680b8d243d4f9a9cb97629bce12625e191937de3cd6f86d21a5dc8b6c1e11d. 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/BGA412300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f439872746beebd623d4496aad1282a2d2c09271b16ab1e6c8b6f6e1ac6bb8a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/BGA412300148.