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 0x0008bfdb1f651e6f13995b4174a23fb00d9f37fec8245c3f101a5122745d547d. 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/10c18805-65f4-4988-8b2d-21697ad9f2fb.json and https://artists.proofprofile.net/proofs/artist/10c18805-65f4-4988-8b2d-21697ad9f2fb.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 0x2dfd8d0a7a8682f7b785eabd414d6378a10f4486af4025e7fcbeb7126d590c1b. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/TCADN1898157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d9fd5709ed60bc2df924b976160f163ef59284edd5d73d977103c19528a63e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USHM91939447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a01d0ebe60db377f6a7dc81d27b44f2e67de0a2b8fdff86cc26ee76d3c268a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:58:16Z), 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/USLD91726740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0241ca50e073852ac8853d024c704b09bbf0d74f6aa87f0c4e624d103dc4978c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USLD91727863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24800561a5b6c0845fa5e69bfd70ffcb157db4592ec43adc0c6eca3ba1f2023e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USLD91729874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa941b358409a9e3a913a24f3f6c413170df25039345a2695a4f477926d737416. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USLD91731046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8500a9a0f29fba1820354debd0120526d88b5180ba5ecaf448b6432c9f66ac2. 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/USLD91732790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eba1048001a709217f0bfa71cdc7c149b59bd8168ddcc22b7e7879f3ba67eb9. 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/USLD91732369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc382d221d69d0f652589854e914e42ddd7c663829d8829102445fc176c664f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:18:13Z), 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/USLD91735961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234b0afdc3bb14c83fc0cbc244bcbd7ef0541e845c7c2c04448d2f8b525594a8. 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/USLD91739961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432fee419c7a7b11cbedc8c6d5b93849778b008706ea2626f6898c4821b06b8b. 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/NL8RL2427562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5fb7d77656c2bdb0d40f6153748bc47dc252ab076565be2f9244e6e29c6ce9. 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/NL8RL2427572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69bb7b068b42c20e7769a1cd5c2771c28928ec3c309874fde488184266450cd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NL8RL2501046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c7f6bd5a57975e877f94029e1244e1cc7e3e3fb071efc644df23c60f3656bb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL8RL2501047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bc54f45b3ea6cc7c0bdd8732bfa2c36b51888d93c8e131896d0f7d3ebcea95. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:05:27Z), 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/NL8RL2501048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf744699462201ecd04b77702dc90061861a9de221ac53f7c631ed5fdcf1bbd8e. 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/ARF102200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75894e87377a3f5866fba0297052172d4fadd7a6c3350d980fc82789f3520690. 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/QZGLS2241285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a53302e41dd2e7124aa7b3e6567f959496b8c1db6bc0f71b7568c5a2a5235e. 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/USLD91729627.