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 0xe479b72e49583cce0ac9175a77d98a4329dc58fecfc86854ab84c56d71d006a5. 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/e2c11c62-fa7e-4a81-9de5-0d14c3e4ed95.json and https://artists.proofprofile.net/proofs/artist/e2c11c62-fa7e-4a81-9de5-0d14c3e4ed95.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 0x40264dea55823806a8a4324c2c9842f1b0f155cd0c3b729b8341024d0643c622. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWU2271713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9b6e6a5ab5a0cac59ba8a710a0541b22de080537e364b7a83e0c8fb512a51f. 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/QZNWW2251392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d031437bd1dc1364f1e0be9e63bb0c43aa02638fa739e0b85493e2ffae442f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZTB22257027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92124c0d43bba0ca89d613a34e5a56eb1ebd30ca67f490fe215b960029da8513. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZES82335256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1082aa69eb65fd9f9bb2bb1ba76799b83053c8c536d9bd3cc30d309c9c9a61bd. 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/QZHNB2311457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a7a5ea52da93e2d4769540c33aa73adccc53b02ab9039dd7cd1de29be4b7de. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZNWR2388336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e13dbc29f29d425709e64a7379bf91539f50c8906aeb9ca6be3a464ad0deeec. 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/QZWFE2362248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a5927930be6c34a4b763fe86cf6ac28cb66dcb8414e6e00d3bf6f1ef2444db. 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/QZHNA2432133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb99490faf3ecc78eafdaf8944ca47d0fc39db870961796e5948e7326283601. 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/QZZ7M2492201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f44fdac4ef58faf77bf734a7e285f79372ff505ab11f1edaf29e41aa7b2af8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZHN82599823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e0fd8527dd4c51d066f1c8e9f3e3231aa62c7678d8c9816910ded9f1602dd7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZMEM2520896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792989404bc3c9be89161fe2e62afb25a9b7a008df2c483c7e33a1cf457e586d. 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/QZTAY2553647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ba93761b43495a275433ea874f376e7c84e7a99b56ff4eb49f110f99bd5781. 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/QZWFK2524979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b42c5e5ad97eef522fa97f2480e18ab118cbf08a0c42e7e8c89dc68b8f0c9d. 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/QZZ7S2527424.