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 0xf7f2d745ddb7b4fd4e9a1cb88474ee91d992ce23c4ddafee30f11ce4abbf5568. 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/76a96ece-ac06-40f1-8b69-a8a430539242.json and https://artists.proofprofile.net/proofs/artist/76a96ece-ac06-40f1-8b69-a8a430539242.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 0xc4dd378276c7f6d0b2460846328f071457457f6adc0ecbc5f1486bbc0c210d2c. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZTAW2213391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3741091fa9067dbd762620314d5eef87a92a54b6fc3cf77b279980e5749385f. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZTB62251313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71261ae0b844ed86a67b711580369a2733a78e34be838e9cd46e543f0afacb98. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZNWX2337767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208c1478a732dbf9d50ba9d27883cc23b9a9ed0a5fa44e9c2ae05c75ced6459b. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZNWX2337768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da9a203246fb497874c3c2cd143c6af775e3f2f5d9f7e37712b3fbdd09b4616. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWX2337770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040cd7ad261c4779f9bb1ae6ffc69a65ce7c9bb837db385750194fb0e5a19f63. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWX2337773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d7ef2cb47eadd7de9fbde044293827a96a0dbdfe5bfca031705e525bee26a0. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWX2337776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8ef12aa1b7602017f59b7e9135222029171321ce83ef2d92b979b1eb247c6b. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZNWX2337780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e6acf44c3f12e11490accb47994505d3d54be9dc06df8b66f79c56e1ff7c91. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZK6F2416743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57642142280db75b70c33970314cc6982288b962c03bb99e8e32fb0cc35f5df. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZZ7N2411804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bc99967501a15d5e7e4e9ac8d43be72b9f17031957075becc990f0ef0e526b. 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/QZK6F2583035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fbfa4e0059b1e143df91dd735a64fd3a9aa1d300694fac598d7d3e1ed873f2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFH2526022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c735cd62592f7c13e85cdc9ec3c112c9fdc72d938b74f1a6f828f33fefc481. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFH2528170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b866835b9e245f41b0381004938ac338617cf7df534edeb02a3865287a1d55. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFL2506639.