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 0xa12fda508ec89c70912a258e5b46dd960a5c1b95ff58010f108e9213173a8a6c. 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/26958b9c-4ffa-4f5d-a909-23f7f27dec4a.json and https://artists.proofprofile.net/proofs/artist/26958b9c-4ffa-4f5d-a909-23f7f27dec4a.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 0xc9fc7338168de9d63d1068700a53fe522eea14f8f6d014b40d92bee1db1bda4f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES71G2120164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578dee9dc8248ee97d193f444cd982034ef3b69b44d9b1079fd331700d83ff3c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES71G2120166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b84f8c013edcf9c9ff8db69800a302191492f067806b0e5fbbbdc23506db6ed. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES71G1819945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f25af8f6102039f62bcb0f16ce754efe83f0e0e044e9d425fbc81356cb075ca. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES71G1834014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f25af8f6102039f62bcb0f16ce754efe83f0e0e044e9d425fbc81356cb075ca. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ES71G1834014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5884214ca66f1f289237551be6bba19bb2d2f0a8b6db96991cb6730b417289f0. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/ES71G1918734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e81570f11f1ca73066a7ac7fb219e95d01e1880554316b2e20fd7260cb45a4. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/ES71G2024844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247547473631f3074d63bd645c05f4e6a49ca4add89a52a1073e34ea18e716ac. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ES71G2060550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa299efa59016369d83fedb6ded44f3f4c89bb906b422df3348b80d57dbe8a3. 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/ES71G2060552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7724e3dccceea524a467e7873d8de319c9d13d9910eeaed859fb1de2ac2832a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/DGA052368696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84be3413c96c5d92144022df2f2d421ae4852be4f739a2d2604d17f42a409c6. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/DGA082307046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7724e3dccceea524a467e7873d8de319c9d13d9910eeaed859fb1de2ac2832a. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/DGA052368696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84be3413c96c5d92144022df2f2d421ae4852be4f739a2d2604d17f42a409c6. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DGA082307046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302fb61f236e41b8207059a3affbdd35d8fd11ea880065310abeb40ee2ccbdb5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DGA0H2482224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49698abedbdc1c956de55386110107ebf20e5bd2304783a86be0103b1981ae99. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR2X42548220.