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 0xb8d41fd6a28b4b28565d94fcc51c463fbb37a7bc614944a228c38b53fbf509f9. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a77a5c9-39ab-4ed8-85c6-58d4f7ed54f9.json and https://artists.proofprofile.net/proofs/artist/7a77a5c9-39ab-4ed8-85c6-58d4f7ed54f9.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 0xce77552c8561f2a3dba395031186fc3a5c7477c09b41a84c420acc0d7bbdbbe2. 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/CAGOO2347086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c5e0020eca1bc1787b2cc7cccdb1c579c61c955d80d35e3d3212a17e4e88ed. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/CAGOO2347087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe915e0d8895c01aeb3fc18ee7ddbe5d040482d1a741b3017c03b10a3e4439c7e. Chain 2 (Bitcoin): anchored in block 958351 (2026-07-17T02:38:05Z), 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/CAGOO2347088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdc1feaddf2ec017c588c3bcf494e18afebecc42e0d473d1d222f6b9c44f5c9. 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/CAGOO2347092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90deaf6db2e54fd1550f0f4da31eb81432461370fee71f8fc97797c026fee61. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/CAGOO2347093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943aa5a5cd26152a67cf43dc9dc01b1b91763619cc6d9d88354f52795bb688b6. 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/CAGOO2347114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89f92bb749cf078dad5636731d32db501e8a1defbd17df937a8e09dd04b7a14. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/CAGOO2347097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6477dbc104197f728c814f0b43c4189daf14630b57dc6ac0f6e66859d8449a4e. 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/CAGOO2347098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560033d7d75f5d745c6d7a3146530c7c7429818b58d1903ccb16b7e4fedfced9. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/CAGOO2347099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f702c47c5da1ddb48853582f647f13e1ada2b8d8121294c0779e4a0143fd99. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/CAGOO2347100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9de8a456a1b0fe752665a5c5e0c8ec22b779be9fef2532980a563b2943e0100. 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/CAGOO2347101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc218693a2c90949345dee85b794a8526beb534a796a790daa6f10e542a1d01. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAGOO2347103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f2b3fdf162743b2e4846fb915fbaaaf1415cdb842037344149b07105c42603. 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/CAGOO2347104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500265c2e3ec6ec5ef797ea611a9d68fade90b34945a701c571872cfa98ea851. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/CAGOO2347105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7705268a70dad57f0a61d13c7094028ad7933aeea57e3405d84cefcf4e92ab38. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/CAGOO2347107.