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 0x7747eac17993ce863292c2a5783a223b5bcbf0d43d93b80639f85d7e62a1a50e. 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/6c350880-8262-4e50-b6c5-7c50ee2492a4.json and https://artists.proofprofile.net/proofs/artist/6c350880-8262-4e50-b6c5-7c50ee2492a4.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 0x556ca4656c853b2e5c5a4fb2e3a2383ba90f58184ee2e013e062579ac12813c9. 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/QT3EX2451298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2717046c91b3a1f37322f2a00f58e5fe1fca52bc6d555e0d4b1ffd11df8d24c8. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QT3EX2451300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf864ae2729cd7c0a05cf9166f02a04ab32e1d378e1a0b9d3a59088af90cba757. 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/QT3EX2451301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf04ec6038846e539a9d0d4696c471b8b43d0595f18088a55c25d8b4c95cac1e. 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/QT3EX2451302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dadaf72c2ab4f48a68314d8c8e9f0b067139e2586a9f05a27a8e45c3d87567. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3EX2451303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebe9544294f65a7d27b5c59b2307df52b6e057bb479383341cbf62a175093de. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3EX2451304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c117ebdb187216d92904fc0b4911f20669e4410ded826fc1f50c5b04741e42f. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QT3EX2451305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0196f3d4934782adc2b5e85db48cf5042277df4ad6e51e5551a1a813e9c084. 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/QT3EX2451309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e48b744aa12fe697efb3a36687d89a15f1da320f4e7e08e1d518bdf066632dd. 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/QZDA52568604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28877f3c3479947a18647c3174899a97d129f9a3def2a5200a2b3feaf4eec72. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZDA52568605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19a3db6e921d811407402c059339bc8d35c8b16b04b2cb9c8bece0886e3e562. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZDA52568606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8fa43444a1ea5019f870b1ae579bf32192086c6b6fd78330d73a86838fdf55. 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/QZDA52568607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8ba671a048e611e1ad19eb2f557c2379658439b3953302db6ac16b602861b5. 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/QZDA52568608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a56012299eeb20d868a5baa251dd90d6372c6f97cf8d1cf853e940201f13cd. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZDA52568609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2caf158dc3ed996f7e9af5d61344aac4c074144d44bfaa2102631e7eeab2717. 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/QZDA52568610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92132bba99519903216f589bc8cc3c960aaa56b651d8297ed7533b86cba86af4. 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/QZDA52568611.