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 0x61e58c3d8a2df2db980d02c76c9a0eab3b4ed41a2d421944e4e5b3588bbbef25. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a210d905-fffd-4b1e-baf8-4d417ee69f7d.json and https://artists.proofprofile.net/proofs/artist/a210d905-fffd-4b1e-baf8-4d417ee69f7d.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 0x3542a4971bd20431d1b8139361816da990a85c5d96fc8ce7c0489c6dbf9244f4. 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/QZYFZ2428004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40aa989845ca00d1d4fd1464a2817ae556c9a0a08b08721af4954e9c88f3013. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZN882401306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e46d99cab9d3de7e6ebc554fa35db31611a868122cf7093a95870e38c551a4. 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/QZYFZ2303140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b879944bdde28ee33c8798c4a3afbaeb6bdcc5279f48abe5444dd7d6003c7a. 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/QZN882298391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b661866c659ebff92d038f926549289e0d009257ba831aadbeb70885b05e0b9. 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/QZZ662424031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaadcef2319fc2aa218eb6a56202dd4584fa6a2eefffd34a10a219598553d8c8. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZWDW2202758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d36f0aadf1cca767ac7d562516652d2c8faebbebfd9026ae63504404749184d. 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/QZWDW2211443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c517cbefbb75af392824f64e10dd4751c04425ee7530f429a7e59afaaa6530f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZYFZ2436999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d70d1924f3a8ce33e9ce9aeb39f6082ea21963254788edcef69f4b3483fe6b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZWDW2214750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85c1d17ce78a1d3d8d42391783e4626151fdf423c9735a0aae2c479e90e5c81. 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/QZWDW2442644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc444c9f3f02438ce489018e8213297e95ac7b2c696f50244264a442aeb05c. 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/QZWDW2442645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa61305d4128a88921198a7cae83dd726c961800ddc8acd22b441744cd82b02. 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/QZWDW2442646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a8fe229d65be665adcfc3eb0a0ee5fbfc1dabf2fd605c4d02c9e35be5f02a4. 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/QZWDW2442647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c21cd821044200657b8a8173548f7c3be2383a1744bd0addc2493ef10fecc3b. 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/QZWDW2224086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3348275ec8583ecb57b017991b5ecab599d3eff842c1803b68c92b46829677. 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/QZZ7S2452843.