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 0xbc4b8fa717f95223f7011a9352aa8fd8ee1d4aa5fea0260cd2a3e4795ae32ec8. 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/622fc275-ff8d-4d20-88d1-5f1bc6c484ef.json and https://artists.proofprofile.net/proofs/artist/622fc275-ff8d-4d20-88d1-5f1bc6c484ef.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 0x3febd5204650876b95bca39f2fd6654fad52f0144ee57195c2cd5eaebb170e53. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGH1123308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3956fe23102f9e983ec513fc4851a8481e1fff4f13eebe053f3500f9abb745f2. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/USCGH1257275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc62b59b2eb78c9f1d3308dfa6eb461fc2eccd87744cf573cc3373c6db21983d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USCGH1257278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cc7434063a6ebd6283a928713d042b5cc192eacd54288be117c2df23d4da28. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/USCGH1257281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef14a1cc3956589ee4c835294abc6fccedf4456de5f59c750b08950563beb23. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/USHM91389324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d450dc7299b844cc0c2fc9b9f6be17012a9c016ddcf4c3474085445e845d451. 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/US43C1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8061473509f7f75b232ecedd89e9e3e1204d23b26d846e7ec294c5200924dda3. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/USHM21683493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6b6a4a805113effde4b1428f5b1e51632317c3e1646cee8d9ce7a96eb1eed0. 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/USDY41660847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd0fe3058de16a07ceaf42f537f53a2e65cb2cfb80f8df6e7d5448802a35516. 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/USHM21662820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1c7bb2f826915431ea198f68f51b6b8ddd5ed9f9dc6f719e9fdda7873c3065. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USHM21683495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1c1c3b5dcfdc66a56f025dee75823c1808eb03d1001cfdc3e7c73eed8b0091. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USHM21683499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb914ca092802bea84cda635e248c40086bc7cce3928fc4d708ab8e57eb4326. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/TCACZ1724311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae1246f95ed393096b34bb57d1c2453c5b5542b8505a514548b3aa68afac213. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCACZ1724314.
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