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 0x00fc4c0fbc4ee96fa4a49fc867c315af9ec135fdf85182de05244f4170b86c03. 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/794b6e57-e1dd-4894-82d1-a930c395ac58.json and https://artists.proofprofile.net/proofs/artist/794b6e57-e1dd-4894-82d1-a930c395ac58.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 0xf2f700fbe94562f0e48c0017bfa559f67e0c6cd5d21edd5d557929cac9e4699e. 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/UKXN22048744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7ed51094902787e55402050b9d4bd613b74e419732e7cc6c302980f63b221f. 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/UKXN22048745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e961d4dd8602877e6025655f894c24df71ca9f3fd4b7dde77e3af906d0a306. 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/UKXN22048746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1092aa60ff2c16e2e8f74e6e72bd7cf19d52087641d4840e9e7aaef22e34cb41. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USANG2278794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4c2a79626251f006b54bd32ed071d86a43446d10a750843d4c66103ae43ac. 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/AEA0Q1948832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7799393600e1f3767c229b7c34e1965786e02570e99451a4ec8fc87ef1bbd10c. 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/AEA0Q1948833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc57eb5d6620b7ecaafde009782814c63a8ef5dc36975f7cd07fa1e0746af69. 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/AEA0Q1948834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1881e8382b7a1dfa209de07db96df2f1f57ddaf4338e67eecbc8e8fdf6665856. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEQ022260614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b9928b1566570adf344c78419eeb8686cb819a48832cddf3bbb74ed4cbb6d9. 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/CH7812234254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2e29dfcdfde8016aae259c8312c4c433eaf820c250191969b508ee5613c987. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH7812234255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf922b375d25927879ad18d60112ef0bdece02758d1fbf4ee6513285b082eef10. 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/CH7812234256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4750694bb206958b7bf4bc2c287caf3b3702f3483d01ee987a24a210e9cbbb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEQ022291651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ac3fb410cdf0ec2d594021a94d3a8dfb41b1b958cdab8f7f119842811505d1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CH7812234259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d3d5b898a6e95045eca3d5c6c4f20e4f892d8008f361a22569e7828162c4a8. 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/CH7812234260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8317ed0948665540b166a53141fc2810030ac5938fb2da5c607a52ebc382b586. 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/QM3DF2138691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b33192c71a4fa715022f629d2b6d3ca6fe1a0466ea89c78ae4fa3545dee503. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM3DF2138699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46992a0737f8489f723f453e723294742ffb791def3f3c6850cd9d9bc5e3a0d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM3DF2138714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea74935a9481af3c28ed77045a6b5c72558c9715b91b56af4d8a8a79a40f3225. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZTPX2186853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f700fbe94562f0e48c0017bfa559f67e0c6cd5d21edd5d557929cac9e4699e. 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/UKXN22048744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e961d4dd8602877e6025655f894c24df71ca9f3fd4b7dde77e3af906d0a306. 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/UKXN22048746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4c2a79626251f006b54bd32ed071d86a43446d10a750843d4c66103ae43ac. 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/AEA0Q1948832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc57eb5d6620b7ecaafde009782814c63a8ef5dc36975f7cd07fa1e0746af69. 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/AEA0Q1948834.