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 0x639e2bb28b2c9735f26970b0abfd2d5c47b0c89638ca27d1500c24e58a30393c. 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/9ae39777-6320-4160-ae13-ec797ef06b74.json and https://artists.proofprofile.net/proofs/artist/9ae39777-6320-4160-ae13-ec797ef06b74.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 0xf3bccfb7b8f8a33a99a6ee08877c543d27c3481eba33db6524d607e191fa8ffd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES7580800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3affe781f219843f3b6b917d5088dd537e9acd093c036918c4de74a5f5a18dce. 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/ES60B2100080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8165108b0e23e526f3e5aad0fbef7c0e0f1d646b53626b2e1a80637fda1cde. 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/ES60B2100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb283230ab2aa203a2f459737167dc81e507f403f4c78f7ce7951dd857b47e73. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES60B2100079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98cf9d4442f07088fd9ab52aa314851530adb7e1f52ef2484e3091f4bf1c48f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBKQU2209794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3f049d3390922b6d6580b96dba5585484b7e91e7e149a6f54ca3d2307b2ad6. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GBKQU2094298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47530f5680895ea56494f96953ba0c74e0626dd3e0c3acc9044e7dc309392347. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/UKU932361172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d07572944946dbc2eb87918427e8cc55fafa991bc8718dbe8a778f539277a8. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/UKU932460667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98cfb1b597df32a96336b156f8bcd6daad4e80f6f84b9b256cd185af8ebe578. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKU932460776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c9051cc480f2be1dfc889d84a76407fc30961732c70e8b79c1d09b33ccfde4. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/UKU932560075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3294a3c6f5967c4d49d741bb48f1f9c41b18f1f77b90c783462aede63a933ec6. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/UKU932560195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2602a2805a584002d4d1a5260502430c47c5880f671974535f016ed3dc59053. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/JPN841000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2a600448925032de9eb55b993a882c8fad012b7ce4879b2dcd8de08ab7c1b1. 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/JPN841000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda6518843ba7a58200741946b21c2199225999a007a618c9c820ab71e3a7610. 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/ES5370200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225654295cc2e4d93745e47dad9769084a59d8ff0e51af05edfcb814e80789e8. 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/ES5370200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c12bd2636c61707416aaf22656a7e11df130bea89db0ced0f8631f71641f126. 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/ES60B2000342.