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 0xcfec81859aeb2f133151295a9ed33608ea913cae41e1e705f1d83cf55e9f8d6b. 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/57202326-fef2-48a0-aaee-692c599ffdf4.json and https://artists.proofprofile.net/proofs/artist/57202326-fef2-48a0-aaee-692c599ffdf4.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 0xa482b8d2d8788ad430bc151dfb1b9f4b4df4e94c2326a8037dd19507d041e127. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BXTMX2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fe9ee68d851f7c2b05d53da8305715815c5bc7f94738bbb9e13b04bfd62f7f. 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/BCMTK2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c57dcb02e6dcc67983f5ab3722e285b6916f6462eda77f9fde76cde7701383f. 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/BXIV82095530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8f4f794d8d67f81e9add28ed07c89d0bdb2c3f45b3d3b99b901ad7ca460fdc. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/BXUGU2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd12704d18fb4ba35dec19a4fbd730fda59cc60de63445f7c98acc94487ad667. 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/QZNJV2034536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e980f6a3c5e80f43f9b3589a6fbbbd0702fb53a5d938c98ec7ea62516b8a73. 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/BXI3F1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8005a5ee4cda905dec64d7035cc4d8b1a26b4d0c6769a74f6977fbff1856f01. 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/BRRGE2010980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa6ccfc2f35e124ba92bb138bcfbd9493e25f22153be20179f04344cddcc8b3. 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/BXT8S2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3303b05083e9de4e85f41268c9234a72b6036dee0354239779c639e2f04ff726. 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/BX5DW2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ecfe02f77bdf331f452bb6c65690dc4285fdb706b9608a2a4324e67558bab3. 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/BX1QP2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e46354ed902d21f0f24d8ae20e1e01cde37eda8759e25a47aac1a9bd592f148. 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/BXZ5L2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28bf24592cc15a0f7be28690a16fd41104131716ecc6f46389a64fded5c3375. 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/BRD1E2000092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ea7387b1a5d4e4b38e33ae359c3733a2d3826cc8a8c4ca087674a7a2a2cb29. 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/QZGLS2029690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99a7c303ad41e2575faeafc0d0d10155b85cbfc20ded7f6ce869119f5ec4d5c. 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/QZHZ52135605.