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 0x8fdaa777e023dda6a2fc05f887956fa3501c912a62c13afdf160e2c215bd0625. 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/fe7c3052-244e-4b17-9752-909b8f9ecace.json and https://artists.proofprofile.net/proofs/artist/fe7c3052-244e-4b17-9752-909b8f9ecace.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 0xd3ee980c6a324395307520a6ce220e0a5d3c32de22a1604ac6a60e801cf7e291. 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/QZTLA2339793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56d1a6958ccced4267c8321040cc25025477191fefafa026f76e916f5729e0d. 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/QZQAY2307417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403b15a94ef3c31303d962efa5f1388a473cc5282e1f0039268c37552abfbb5c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZQAY2330422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6d193989d467f4bd65f780d98e724de3bdc44fa1a94390c3e6bfc3248f2d44. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZQAY2307101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cf8163eb0d8ec59552499faac0cf51176072abbed971ed381fd73eb609ede4. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZTAW2254345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6226775121712c66f216ddd90f1cca44050d9f1c07d9e53cd632bbd8e5514bb9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTAZ2219961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bc14a642d290893193e3c7ac872b2f84214eaa94edd1192d23b04442223995. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZS7J2307088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af6955b8ffc87d368c0850a444eb8ae52ac894019527782c8f5fbf965a0a917. 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/QZS7J2339793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaac9b552e7e124e37228b4f475a3938652c6767cc65dedba69f338e4801bf5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTL92467301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9300f3e056b4877e1547efc339e1acfe47c24de2615b92669d9a9dc50f51b5. 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/QZS7J2373142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af6955b8ffc87d368c0850a444eb8ae52ac894019527782c8f5fbf965a0a917. 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/QZS7J2339793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb47a974e205c8f9c6e4557119e3d809309a3ce2cf697deeb9e5f29563448348. 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/QZS7J2372471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1453318b2fb149429c8c5267dbea8fc0cb8fcd62792c7ad8a28814fe4195d93a. 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/QZS7J2311624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bc14a642d290893193e3c7ac872b2f84214eaa94edd1192d23b04442223995. 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/QZS7J2307088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1522b2938cc248c792ab56e359aaf7694ac93c8a2584608828118a071c19082c. 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/QZS7J2458633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600298d23beaa9b102b06817f228b818b1d441a575770a1179c9edd89bb1b3c1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USA2P2516695.