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 0x4f76f5b0921f8989dc48126cbfe1e32fe3e1a9d8b3da5ad7c950254a2a51ac19. 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/a1c262f6-eb63-4129-b292-dbc643afffb9.json and https://artists.proofprofile.net/proofs/artist/a1c262f6-eb63-4129-b292-dbc643afffb9.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 0xbd397df5ae372ddf56ce75f4b7ca5572c2d8372de884f77f8f0e5a62af5be575. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BC8DD2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6493aa61b912c0e0ac091df444926a6007bc4bd59835890229f06957a4e3be69. 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/QZNJW2461680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c28d420d63d1255075866765f7edc245558a57cccc0e62c6faecdafe7dab76. 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/BXIV82461210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6a5c83c2bec3e86bf7420f942b1e04aeace601799c442a5d848d9c34a5436b. 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/BRUM72302012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c29e1fbbdeac0c65e73558ba9efa8d75e72bf75dc8036ea991bdf7365daa3de. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BXIV82312392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850e862c14644a1ffb8f29350356506e701f8f15c6fa6176ebdd34a217cf2372. 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/QZTV32417048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bbd8c5fdbc6eddd8dc905555e4de6dcf4c74a80f35535c3d98f6f4b6e5ff8d. 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/BCL2K2300306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd515bd1ffea974d083a5c83849b2f1d72171768723b575826ebbeb544443c4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZW9K2349401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63916f481c6360b354a078cf9d26fec9598786f529d103dc019feba3c171aad9. 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/BX9OR2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe851b4818df50ae521fd83cc559acf26e11849e6ee4e79a1ad93e1d4b988ae73. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US7VG2355172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe429ec8052db649eb9ca38dbb5c7bfedbf3f6aa6d6cc3692b039a554c6accc1a. 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/QZZ8A2460299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844566aa15aa2d69525634d6eb4f83b1c8883ae550d07d4bc880700c6f0bd30a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWV32476245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213d2916da8d7d62df23f8a9d43b48fcccc3bd82be1d1934b23882d8974b3553. 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/GBRKQ2576057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24a50ba2985cbcd5618ff796f70e19c5fe9ed4f061a85576cb377e84e83d154. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/BCA2A2401229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7aebc67095f61eae4033265b27b12685b18781d4071d96759a20382e96ce0d. 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/QZTV32507178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf50de5848bc82e3e02b23c4e9527ce89079edd10e5630902098afcaafd339bd. 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/GBRKQ2510489.