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 0xf3b7ce7ddac751f8dbdbb3cd6397023db83a2bfde87393cc32807b7615d2a041. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b004283d-1adc-4070-896a-4cb424d722fb.json and https://artists.proofprofile.net/proofs/artist/b004283d-1adc-4070-896a-4cb424d722fb.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 0x7a6f85b3968703aaf73d3ecb5eee372a768b48959b811e07186a2e1b393aaaa4. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/GX5MY2430067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe71cfdc9417333e7b44cce73d82bdef59e409fae8d73a83be9925d026538386. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GX5MY2417865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6372c6608ac4e8c95b1408c6142c488b43a56bfbc9426643b3b45a68b9bea80e. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/GX5MY2486846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be4becaa41c4b65703acc458a39375137d99f93045df359a075b5f253add88a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GX5MY2424793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39159a4a7ae02180158d511efc0be850ce7753646a3998bd633879f400fcdeff. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/GX5MY2424464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b9950975df8469f55094304678e0452cb78a636c35b5a88236894f94a9b799. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GX5MY2456707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be9cc6b16a60af26d06ebeb5610fba572316b0b0dab1b2ba2cb9ee3dc0ab3f4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GX5MY2431729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9010850d56478c36803329e696d6a157a131d0f885796446decaa84cbfdfda. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GX5MY2427556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bb6842bca5d0729fa39f2ea0e491586d3b54eb28f4229ba873ad8009d494d5. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/GX5MY2493885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fa1fc586fa07349ca31b0bb74bebb2b45622336709836970edb33266a2aefa. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/GX5MY2450405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5abcdb862a5a67557a805e71ec7e364ec08181d96e03a11e124aac3d29ed7e. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/GX5MY2473275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878a75301ed24fe75a10416aa1ff5eb2ff6103866662363a3a7b7c73018b2ae1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GX5MY2466104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2d7011e4b878be1051828cc9e07fca7859661055aa6d3196f452d16095c5cd. 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/GX5MY2453002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3c64f2af3d2dc19baffe093a0de9375e756b2b7752eea21fc1438b5fc0572c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX5MY2488933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713af27fb160fcd0d7433f2aa2e9a6dd43cecf5eafe8867193b8d01cf3d8a61d. 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/GX5MY2444144.