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 0x98fdcb3746603d8f46850d0856b99fd3eccddc74b70c2c15921649bd17343a79. 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/ab3b04f3-99f6-4a9b-9855-f3e4d4defe16.json and https://artists.proofprofile.net/proofs/artist/ab3b04f3-99f6-4a9b-9855-f3e4d4defe16.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 0x2d65506934c6e0bff5edfbb98e8f16ebb63cb8a63801520add8e362974cad315. 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/USSM11914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d65506934c6e0bff5edfbb98e8f16ebb63cb8a63801520add8e362974cad315. 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/USSM11914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ad3694a165471425cd5da1c16ae8392da5674be9a88b100f7181db11b79d1c. 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/TCABX1494846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73021cb149a8e95dc4bd0f7ca8f783875b3b374c181bfcef895a60e78d55f02. 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/TCABX1494849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacafc59455f1e02f4a7a3a4b7ddf1c9cda05ac33868cd8422a1ce3e4797bf80e. 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/TCADR1849366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5539b5ac4c9714229b10ebd5b9747a2de14ba1c6d2164af8af44c36abf78cd. 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/TCADR1849442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cd58933b71b36d0bbb7013614e0583113f3d9fb953ba3fad67afa435a4db70. 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/TCADR1849444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52160f9a229a5dccdee3b74d9e0a4c4ef8c0c9bd42e4f4e0b1116d9f2d4134c9. 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/TCADR1849447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7230d48af8a226185da947ccc6e6a9c0ff5a3d7b63bdf3ac2e9a2e6d84d4bb. 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/TCABM1362580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9fc45f1936c8005307d4deb8812ef0dbb5a1acd6dab22300245bdbc8c33673. 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/TCABM1362585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db8f4b655eae03a99090ae7fc27c383b2a94902af9b8d2a7fc3c07effd38f17. 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/TCADR1849381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93ebd4ce4d9e9554ea044bd91e66d0d62f3086ffbba4838f3c3d9f1777e7cd7. 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/TCADR1849387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb205af77fa03610e41ece29c444756f031a191d5a577db35722fa4dd34d4f1b. 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/TCADR1849382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0b7594b78434b4a37080ea3f8a14a0a293b4d436bb9cf6cf7d1c05bc7be2fe. 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/TCADR1849389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73e1449ccd2fe79c362b4ee8c6f9575aba325d9660e48cf4c0f5a8ec34d55e9. 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/ZA56E2304377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e365d95e886ccc5661fbe8620438380a92a147b953f9676e4a8918bf2b54c5d. 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/TCAJG2504701.