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 0x02929ca7aceab3a0fe1e3759f24162524ed9c56e0da17a40d066cdacf34d71de. 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/a181f418-3194-4e07-9730-a072b3018df1.json and https://artists.proofprofile.net/proofs/artist/a181f418-3194-4e07-9730-a072b3018df1.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 0xefb14c109f9f59fb95a24f5b9881b73fad57f7030011fdd8bd6165aa34939141. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZGLS1997683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4226f32d84330a59094cc9c3133031404725a51ffef426b1d3b78fe0318cb8bf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHZ31976497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf525a81972a369456a79db8d4ef3d9f21ab5a9d8c34e60ecbacccf5de54c1cf9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZGLS2056538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e472b2542fe97e412ecf7eead2ceba773fdbfb31914b2d5f253f0a161c8bac. 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/BCEOF2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598471890e2da26c24a58a69f463d581e0557f25728974b13e6fd052be0be280. 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/BCEOF2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2e30bdcf8c93e383b58e539fc63752bb051bf4fdb05b46f859cfe0692d5abd. 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/BXPOB2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ac1956542e14cad6820976a7b3d365d73a15d5669caa535decb030f21d158d. 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/BCEOF2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ceed07772553b8bf90131fa9db2a588d5948d4fe29a3bc0c33ae7f3a2a2f770. 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/BCEOF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce3805e6dfdf4f4277745acb120bc990d24a62d3cdeb77fd334fda8253dce3d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BCEOF2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a60b9ea1577a280508dcc71a60091d4b8b73aa8ee7c840b253b2ba792d1b81c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BCEOF2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedc4a4ab03cc3b880ac13d9f6d9a6e514137412626eab5037375b5ff4566f56. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BCEOF2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822c88b875fc2141d60b5ec95f93040bdecb052b8a37ebf43c8df2b69e83f303. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/BCEOF2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2db9a347688e5f36bc330663bc9c2c17b44b2bfde1d1b1a2af4fcd2cd886db1. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/BCEOF2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aea4953edbcf8a40ab9b4382c0100589440549efbad459fb46089526d9b7968. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZNJV2028492.