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 0x9cc6f2b480a8863e10a14dd0674ef4112cae94b5dc6be08cc46b6a3abbff0469. 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/8f212951-13f7-4057-8b2e-5734dc0b81f0.json and https://artists.proofprofile.net/proofs/artist/8f212951-13f7-4057-8b2e-5734dc0b81f0.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 0xbf152ea084b7c6723f158f4962731457b758815230a0c0e57787068f9ac7998a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DET749800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead1e6270da7cb65c02e5150a78e32cdd158290de326b5c847d1acc0b1271d47. 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/DET740100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdc8bc024f45dc30bd9c8b278a2cd8f3cd28236b64c31405077b81da56d4de8. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DET740100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267f0ceaab80a310fac25261b77bdc655992b8e052646ea1e73d712357fc0cbf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DET740100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199fccb7cfafc2880a47224aff86438d5a6a3794e83377f4576561598e0b985a. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/DET740100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5ff9275bdf1a1eff35ec901650e4f3c8247da1942ff9972036debdca523f27. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DET740100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec78512d96bd1f6654f208bb8704aafdd56132e7d2f9b33d752bd226b0cc6278. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/DET740100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51170a31742dcbcc6e419f4ce174516683d1dec261076be0cdc83331be0549f7. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/DET740100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba80a655041774aacf8d6305e635fc2fb1214aabab2175902b4ba8348dc59c98. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DET740100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e28ed82cd18276e6f89af05ad5d6080e83fbd2045a1b82912418509e1ec5c5a. 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/DET740100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb349882478bf14d84e100a25f90d653286724138da18e6d799e31a3b883519. 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/DET740100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898ff3bd7bdf962a59fe6497de721d68b3f460e730a959bbfc0987655c9be451. 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/DET740100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5311b1ad8678163a768305a878266f1f9208a25f4eaf1a79b5eea7517114a83. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DET740100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86782ad44ff26faf86f4a45d47f797eba51e7e7006d98c4bd5528f0ecf093d5. 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/DET740100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392c029b58611dfbbb19db0a5ed1a32f82c6324450917e621537f823d88aac91. 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/DET740100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4379f7bddd3c6a159bc6053d339cd356c0b2955f76ab11edd1e57f46e9d80b70. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DET740100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1788c7d360d7b5986a3415ce565c1899ebe9a0d737d46f199c37a4e90e3377. 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/NLB770100013.