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 0x007a6969784056088a626af5610802746e5d1bd976fb3fa108cf39f6a11ac499. 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/3a0dc6a5-5aab-4f77-886d-c66ab1a58962.json and https://artists.proofprofile.net/proofs/artist/3a0dc6a5-5aab-4f77-886d-c66ab1a58962.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 0x01eef7504423e2149e0a454a0d5ab3e53561c7d4cdfca08ce289733042512d2a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USHM91369189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f94d03ae73e2ec6cb14c011322ffe46d724510b0a8898ab05a4892f30304d53. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USHM91374303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3576805d7297911c17d5241a5bbb0bd07c2c7c18ca13d51e338ec63091be7090. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USHM91374306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10e14de116c92d02f141c46b527facae164f42d657e2f37598c1b5f1e5df264. 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/USHM91374307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f2054ba9583d4ebce5896a14cfee72b3d0dfd90fe084275aa7d67eaa235a93. Chain 2 (Bitcoin): anchored in block 957655 (2026-07-12T04:42:44Z), 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/USHM91374309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac390c92bfc34a4a16adb8858d6840f47fe145892a40ccea4a0855c651af661. 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/USHM21430154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4847725cdef7af3fe06d3b6dd8b26b55826412605d33787e4524c826e77e78f. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/USHM21430155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5b70262d2792e1f8c745aed7d51894795348015f3f2cdfd4d8be6c3821c74c. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USHM21430158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eda2bd227f9b8cfa8f1c272ee7aae3e084b19cf8ab4bf06b0b36d4f72becb61. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USDHM1718068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5def2245885004fe89cb769672f15d230109a0db4fa9d09b85cbe67f2ea402a3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USDHM1718069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4a4f50548f2e227ffb2d439eb67d1608a98debfb0634276c1737a6dfb54a64. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/USDHM2018122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9d826bb34d5982816c5742b7f469ab266d903485575c40f361842f9eb18631. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZZ7S2458672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b80856bf426c216c0fd989cfc9d856d3f55c12d45010bedf3b59de2bdeb4cd9. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNWR2296876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6aac80a361f75245acce6ba497ad9e96a5196bd14f2c17821782ca1074b731. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US4NA1500516.