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 0x8a895386f23ba269186024175786b63e995e1d014d39f6966fc0f94387bc1c85. 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/16472ddb-893a-4ee1-9f4b-5168a95b442f.json and https://artists.proofprofile.net/proofs/artist/16472ddb-893a-4ee1-9f4b-5168a95b442f.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 0x61d266f925d70fdc6c05151fe5bee74c10267d804437099b0120ce610bb2cbdb. 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/CAQ8S1632481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1353780486449bcdf69492ec5071b982f159fe8ebbd289834b9759d23a9b1249. 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/FR2X42116695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5073a3bb6ea9c4c2169ba8d0878ab1268ddfc7e29cf623ecac85947672a477. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR2X42153510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744c2cf0c44a170e1686ce9a0ddc8fc3d206f434600a2c697af652901d5fe42d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX282138796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2accbd22f1e8ec8fdda56206d13e2f9a0916f54138ec912a426db42a45cb6690. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FRX762125825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38a834f79d419a8001697dc5673b6e001d5fe4b91fecaf8237a71bfadf4c8c5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FRX872133544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16571ecc7ea300bea4711bec7f9567e1d225ae303d1a4924d35efcd0d72c8d87. 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/FRS182135096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2ea57d208318aca21d4aeb9cd9aa651a328528b8c9237bad4ef4b2eb64c8d2. 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/FR10S2261815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f75b4ca7145d1661883588fb5a8c0168e3e39eae927cd5d40a36d766c8413c0. 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/FR59R2212442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfda19e9a57d063546328ddc045265e8bdf0f48e7ded5063df995cfbd7eb358. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/FRX282242170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c88a6cd2685cb0bc89099a5837ac7aefcfe7a5617e4f3576ca788dcd668723. 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/CAQ8S1625987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8070280e1538a19f79a93b3dcf56e59017b4dc7d3fab3236d16905da909ea7ca. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/CAQ8S1625989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9595dfcedf5527f15a2c6832f06bbe47c75b05aa593903eaf1fc8933a3b265c2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CAQ8S1625990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dea0ea1c93366b46c51e58009d5d47c6e2b4a66021c757a778f158db4337ff. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CAQ8S1631684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd796c2ea34341e8cf43f68696cdc7c569f841923c641f0f3775b3163285501. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAQ8S1637825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad115d5b28ce42a1d3b245972bec67693baa34acd3b3c008ef4bb0cc714d721. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/CAQ8S1643701.