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 0xe7f3a0396e86fe844722007e26b3e4821b00e87c13318e3059896e3430dd2030. 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/720303c3-23bd-478d-a1c5-a71a8f86aa93.json and https://artists.proofprofile.net/proofs/artist/720303c3-23bd-478d-a1c5-a71a8f86aa93.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 0x22f65519fb85ff54f2636230a98d1034b8ded07d2539fcc938c37b4588874ea1. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/ATMI51300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2f0629acbf4b016a78e6c31e0b239482bebb7bddd5b156abf9a259c7839883. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ATMI52200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57853dc71f389a889b86404e04a7d0bbc10e6f99b51ec714db6da1f70e3eb77. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ATMI51300408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcac16fde84e2e99c91ae257765a5797dcf5927a09809a5ba1d6408e8a88035. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ATMI52300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d66f154563290415c2501d39d7d9170f61b622dbb2f29e0509e0d1328ffcc4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ATMI52300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7741efd94d770a72b8eb6400f2a99f3eb4d8b1195758ed5c2b31626512d5c64. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/ATMI52400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25af8043d8dc24318a47801c2b5a52a5e009acc445abe87dc8e7c677bf571d48. 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/ATMI52500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473ed1a02c4e6b6550bc83f158f7e1877ca5de57bb20371b760d1ce1006fa011. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ATMI52500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25af8043d8dc24318a47801c2b5a52a5e009acc445abe87dc8e7c677bf571d48. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/ATMI52500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473ed1a02c4e6b6550bc83f158f7e1877ca5de57bb20371b760d1ce1006fa011. 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/ATMI52500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd99cffe2c3f660b3cb609515affb2679aa1937cceea05db1c0b6c0d3644edc9. 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/ATMI52500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad4cde102a856927b25fd72945a11f7826419d4b8d1a0a11bfecfafa33d073b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ATMI52500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ca56b29cc8844bf841f37a2f8dd7d5172cc2053a1c5faa1f1ff5d413abf9da. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/ATMI52400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7c1b95cc7f4c98a4b940c5498453c9df87fe6bd25c380635b12fd6c480ddd. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/ATMI52500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f028cbb7620abec84ff9e58c65b7397fcee4f4dc403da681e724d029fef65a. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ATMI52500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7741efd94d770a72b8eb6400f2a99f3eb4d8b1195758ed5c2b31626512d5c64. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ATMI52400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fb10cb905bc3607705c8098c20e9e83d963eaf490dc17dbb6adccd29a63ab2. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ATMI52500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbc915e5e2d7f486a5513a65ecb4ef4796dc84b7360d6970af8685e48c23b08. 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/ATMI52500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455be7567772460a7605888202606c0e67959016b7f2b35dff8f56561d24dea4. 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/ATMI52500010.