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 0x4fafc14e4e2c0c6f1ee341d26f552c89a2886f145057c40dd6561234977b0a08. 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/f32b7ea7-4c40-450d-ab52-bf5b135ebdca.json and https://artists.proofprofile.net/proofs/artist/f32b7ea7-4c40-450d-ab52-bf5b135ebdca.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 0xa5e7d15268b52cccf10dfd74a4072eae080385f5b3a8492a405afbbd9ab986e6. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZFYY2276073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542dfd4c380dedaf1386ba4f4353166e53d79e7adeafd75220682c4f5e019194. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTAY2253649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf6e7a497e69b08c5b43ca493585a05a85108da13dad391da3af4c207d8fe89. 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/QZFZ32407075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1e9c4272ed33c338863a69b1c7d9fc20f4d84b0d9f0f10d3b3b6341bdd952f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZFZ32407076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799da088ee77d2d762c923191ee14de330e89a239cf1de6b81c6253ef529c4a. 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/QZFZ32407077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7d9bd8c82e8512abaac95b0177d19bd7a26cc86c4d95717d7779dbb4928876. 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/QZFZ32407078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd837ca71329fabaeeeb15ffa61dbd328ebefe84f2f77b7dac6b7ee59874dc584. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFZ32407079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70b7c57d20b73d066c63672c26efc605d495e090fbbf905dc9073334e178f3c. 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/QZFZ32407080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a93ec4f802cdd45ae23e9d6df8d56a63f37b9aba142d252de81ad146ec3849. 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/QZFZ32407081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ecbbadbd70fb506046d1f6e284decdf21aae8070a919e8be54cbf49ffb42f8. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/QZK6L2491140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4bf01b1a37c126c010fc9ffc5fd0cfcc6d357e71266d201ff0bd069d9ddd71. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZMEQ2473623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6d3132cedc800944263b8719ffb8125abdf49a271f5d0c171901213c5e6a4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB32412067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334634f5201c75eaa3f4f10f8bb3bc537a57cd87d7b1fde56f4080a7449d15d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN82266788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82eedbaed54ae0671a1ec5c94bcd4cf9e8ea50a61679952787e2ac6e3847aa0a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZSYP2281456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fe33475e4ead80ff7cdf1cdc3488cbcd6d25829ca9fee5fde4b1aaaab96dc4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB82499517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a653d7ecf9d8e21894909c28927032e6e8da5bc4eb52639f051969dd451147. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA72331234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001a2b82be43700697f82812800854885d637db70cebf655efa5e6aab7242b03. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES62351411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa944b033eafc46caf9bb7fe779bdfd132c71b99d767c5507aefd7103d06bba66. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USL4R2221729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7422f711eff558d3ebd8d486f9edd1d2307869fe15a317ef53865b26a3a069c9. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZNWQ2351394.