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 0x88df378adc3597b96b0469ec5abab22f9428ba610890f744b9880a1c131f3b09. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c83dda41-4cd2-4d85-9c7a-63222930eb8b.json and https://artists.proofprofile.net/proofs/artist/c83dda41-4cd2-4d85-9c7a-63222930eb8b.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 0xd72f7e9e1bc48a5063e7cff62f7d01c96bc944034e7018c866d94ccbc78bad71. 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/FXQ892200372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3ecd3e4369ed862d73b018bec94867b7e236b6a3b02b18ff84d42b3f043164. 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/FXQ892200319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ffa2a05201cacf71f07ab7bc8c57fae20eb68983abf9ff6f2c89c5956c34cc. 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/FXQ892200227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ef0be72759dbc033c7b017c3f179ded77f8af24240c2921b0e3c614ac43b78. 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/FXQ892200147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3429b2e3120cac117ade40c873fb2fc0088d9a48943b97391c661235604e5e. 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/FXQ892200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b0e9ebbdf1b7a93b01d9a02de86d487b6e2fc604eb8a59162c291608cffff8. 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/FXQ892100117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ab0d6c438de4a844d2af578f635a958884ee37badbbbc6f0cd36185cced038. 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/FXQ892100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0a02a76ed384f22345efbe204503fd603136c53d028048a9b5d7bde855c584. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZGWW2124800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20de11f834e47c4187e52ceb14cd25f884276091255355bac571301b29072e9a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYW2099781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4db5ec74834a0e41b28048f88376e86b72c707c6c16c68dc7a496727ca6e4f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFYW2099782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38321b3dc844c47f8f2d52cb9b49d40bef4162b83518df8127e880dc149c027f. 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/QZK6P1977285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898d6179b8c97cba32282b163be7936fa4ce9a457ca49e8af39064ae4d4cdfb0. 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/QM2PV1805693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b67b0ae9c085e73b313554a81eadd2051789251de907ec0e897104de8106b53. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QM2PV1805694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fe6e6a0426f0203ff54cb785c3c9538a773db69be812c539fc2b36010d87cb. 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/QM2PV1805695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d4755ed23d07ab81a639125eb6b485f6c26ef25ceb3dcb7681d895729ca22c. 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/QZ4JJ1772335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa69ac745a25320adc7bed1ce8947327d4db87667e4d88e5ea3ff9004c9b408a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZGWX2044325.