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 0x1e2434802c8bf410a5ed329d1fe416e3e11a7527459b879bd987955e11eded26. 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/5fbbb70c-ea7f-42c0-b4b3-1d56a68902c4.json and https://artists.proofprofile.net/proofs/artist/5fbbb70c-ea7f-42c0-b4b3-1d56a68902c4.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 0x227b285e844cd3ae3a2deb615219093960554346e0c7f88e39b137781a35d1bf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZPLS2233252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34f1f2db77af733ec92b6ce4e9ade4b7b6f1a70222959cb56fa213de78996eb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZPLS2233253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d52147f4f2a7758b5ae48d577136f1605efcd0aa5c74cf4d6b1b5c80a6cbff2. 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/QZPLS2233254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd457abbf5cc7ae98d5e0f79fe5cde2047a439db809d5643266888340d1bf969e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZPLS2233255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9a3014b1ad338b50e8a1ec03f8cff486af2ff6547b53a24feade7ba16e8b87. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZPLS2233256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5f6b5c0d8e760df90d4d628237dad9353ccde400f8e7eb5ef7c659de08864c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZPLS2233257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22600cabe6ea9d6854a962c48bbb1fcab73caae8b144adfc105d72a29cb04c7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZPLS2233258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc156c6f21317236cf187e91b3638663b9ccdd900cb452e6d09d3571716730219. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6G2101276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee996d0779f2c2a9719d13496ba1d5966c03546ff581603906f185b6819b42c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6G2101278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30fe1260e993af54b5e59d67403f5d269cc5273b8bcbab1478bdbcd7a0325f4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA2P2358640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383dbc90022610eb5c8e95da917e151d6207b6170cfd671505df6df880d38092. 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/USA2P2358639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac20bb99c617efd311200dda797bf8914dbdb82952376e3f7c0b31cc5be31bc0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2348241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0145ac3f89a92dacc7f817085b15d95e79f9a68268724e0721d2306afcecb7e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2335902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabf6fc923d856524bad27c8339d00bc2ef906a8afd1eeec6736f8a24977f279. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USA2P2319904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960fd9fcc9b2835f7d7b03f9d58dfa190ffef6ed8cef66f09d4140c1dc36f74e. 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/USA2P2310634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287c7f466fc30132b00a71102ea7ba8b3e2091b92bed79e693adf7c3a516f529. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USA2P2310622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0888a366df7fdc672149770ddf248b0e0c5772714b53d56ed90174586725ce70. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USA2P2310643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a3524040d7d06f051b07961c0d0a8f51b7d9f4e247f9c2ede230ff6509cf32. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/USA2P2251836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c30c91b2faafb9cbfe34d86d31ec41784fc783fcfba3d2666285bacc023753. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB32245645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7359b16ce3081347d9f0e8248b2fffe4300eb8933d4cbd6d7e50763ed46e504. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTAZ2256348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a76be3178077b569b488e19772c7eb780425db3e4c054b28871fbd1b48a134. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZMEN2212161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f6b39bce636c4764d5e5a842339f9a54589d688f3e02b6a51f59a321b2721b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWT2205941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75ed40935505fae6630e02a8e5f22fa931bccb6e472240843859dee1335d790. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWT2205942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e44db3dc8b1d71c8764cd9d39faf8f734f5d2d4311d258c011cc1998ebc1ab. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6J2280143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bf6af9e1ed9d11f95313384bcd955c65ce3435f0bac123621edaad034ca3a5. 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/USA2P2417615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a5355d0ea1a4471d1f12e3e1c75dd3ca2ca660471239e4878e86be8a8eb738. 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/USLD91755423.