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 0x5a7de4f8e9436044e6e69c2e31d927150979ab3be19d8af5ab7c29edb1b8d8e8. 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/1825e96f-5143-4f57-b067-af2770345f19.json and https://artists.proofprofile.net/proofs/artist/1825e96f-5143-4f57-b067-af2770345f19.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 0xcd4e7a54a8450a545ead35c6ed8019f9ef0c1822f377f364eed4449ceaf205b2. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/SEXGF2201365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6025515e07f721440023b4da476bf194bb1f762152cb2a8c4fd8ddfa708d6a6d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SEXGF2399220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9feca6bfd673ae79b6b741e5e9ca0bc70611ac09c5cd2f4e87f31da566d3dc. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/SEXGF2399580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4c0cde3e1505cc4ec40b827310d539cc87bbbd33623030b4498d9431dc5d66. 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/SEXGF2399634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e42e56f99d1d75e7981b0fd5df1657b589e629e300e34882165b717add5a8e. 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/SEXGF2399680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6077a9ad06710ffb635a0c80ae1e0ac748ffff45c984d5d11113fcb841f8c4. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/SEXGF2399723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e1836cd8d433d83a8a8a16ba4cc72df20d1d7810778a26353655cc34f6c303. 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/SEXGF2399751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be01037c722f05bbeea1f891c18518fbb8a7750e7584a49e0a5c2275aab0099. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/SEXGF2499143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4dac4ec03b33889423905a00dfe21733bb424333e4eceb58c50a11296cfe11. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/SEXGF2499184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fff261985c6ae05228f8f6cfc525ebe74191fdea5f9ffaa680fcfaf16d5b209. 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/SEXGF2499261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2419136dbbea7bf7a4d361797824a86b73c62260611a9f6bd982cd9f9ed1fd51. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/SEXGF2499295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b986ca7d5193eb660aed14970a27f307ee138142017105d0ac81a0c850e658. 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/SEXGF2599082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fb7f6d13d95806998c79762ed23a3638bc9ea77aa1d664b12dad72cf480c3b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/SEXGF2599193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff534ff19173c9ee3152a149ad041caee83186c1cf3aa96434a669b27546d541. 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/SEXGF2599227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d796802b164436bcef0b547e97b05882cec50e7eddb46737e6a0004d6910abd. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/SEXGF2599336.