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 0xd05493e1fe91b8a4704c2784ab96bded83f39685b6e6d3eb48a2e314e072eed8. 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/44e2b6c8-e53a-4039-a9a9-d688e7bd0802.json and https://artists.proofprofile.net/proofs/artist/44e2b6c8-e53a-4039-a9a9-d688e7bd0802.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 0x137571b0f67580706fd47d8025d21e010a780b41caaa1eef1a76b222b9c7a794. 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/QZMHL2324589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931fa7a1dd58e8145bcc1f6ac6f128b91a576b94b57521bcafa5b1d122e3d55c. 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/VVYY32156789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31900686b3655ef4bfebf208b4ec71844620e8680efc209311885fc9ede6bc1. 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/SE6XY2357417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64320cb851cc6641c23e7992d6e849148b96ccf15d59adec44d063277583f112. 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/SE6A92380344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2dd2be3eda5c42cf027d08f04d1126a267d601282ed2a56bd7631ee6351b6e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMHK2091839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7169ba1207152d1ed74105cdd5cfa4ccabe38c148333b839da272f96020797. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:37:02Z), 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/SE6QE2420059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfda3fe2383c86738f0cbc715929483aa83a79b9753b9cdb7ed19218af0c77ab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE6I32486309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a4fc818eb6b19c935b54a04c0daa103b40886872656f109a55f09336846396. 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/SE6TI2339450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9661c68449df94db7a2b3932ab343fb958cda312c05952994ce5603de091bb2. 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/QZMHN2363236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a8beda5604d2fc91896354e4bc0bcd35ab63049ae403f7d6dae297d6b5b551. 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/SE6QE2358670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b83ecea5a7de255d9cdafa7f744d7ac97ba17069c5ff71c733a80f8aad68bd. 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/QZMHP2341391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9276215a8b9630631256af31de8f4cb725169cf71f9cff5afe20003ec0d26ab. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZS642338940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5d4d0e7d378a263809af792bd8ad75fbd98752304f8f24903fbe64fb48bab4. 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/QZS642365208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089598eaca259efb7ec2061caa5f75f6a291379cdc5a68097d3e0b74ea6fa6ae. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZS632394243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3973d32528334577a13a681bb3b2afb7e6e6b8f4422fb78502447b13b4fac663. 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/SE5BU2340114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd04008946d6032b9cbfc87ef8c6fccfe2482b09b51e9d363a6928fce41f3c8e. 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/QZMHK2352379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e259a22ed9038db32c3b7338baa12969438ab7d13febc28277eb2c3111da88. 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/QZMHP2303974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7804027adf535f7745295cd24b2d5fd4d9551e451b739add07cd15fb08a5992d. 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/SE6SA2424990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6384598a60042f2fe463c03a51e79046767820a19af76144301c467caa61f2a. 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/SE6SA2424991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6571eaa07353b8d7aa2e8b625b57e9402e7da69716a4c132a0d053d06dc83f7. 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/SE6SA2424992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b80fe696236099204a7fb6eeef86fc5db438c15770c4f889bf28c3573b3c82f. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:29:32Z), 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/SE6SA2424993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e107f8bfaf739a31ddc9b782300a2f0eeed623aac2a6bb75457b452fa1bbb5a. 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/QZNWW2345389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e963172adcad4e8a7756ce67c218c60756f3b8ae0155bdcf5b79ccb094f462. 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/QZS662267266.