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 0x7d28e0dc28bd6492f891ab8eabd6a9c04c22e85693852c66edaeb7341b01e575. 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/981556d6-cce5-4fcd-bab4-1c81b017696a.json and https://artists.proofprofile.net/proofs/artist/981556d6-cce5-4fcd-bab4-1c81b017696a.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 0xf2a4fa7fc53edf67dd23093e6edfbc278d60b9631d7c8651c2f3709af7d5f007. 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/QZHN82294507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc442c125f19f82d80b371b14d6c2a940958ee23e6ee4a056723a5b1e00e2d02c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZFYZ2340889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1016a6f3f778cfd70bb3f759f9625bb87d2554215ef86d72ee985b91db7e9f5. 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/QZDA42364696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcc91ca673b62ed68a45866596919e122f4448e0592c98bc48970f47b8d8c90. 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/QZDA42364698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9996e3a96b056491259d7077cd4e07ac641474537dca8bf09765cf4871ec483c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAT2286691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a45d6aaa0ee266854bad7a823a43c122d65d35b7c9aa5fefef223872f78717. 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/QZDA42364699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343c717e8f538ee717cf583f78caf47cb94c4f13b7b5bb137354ee152eff7e78. 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/QZHN82399804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fb3287fd463939b3ebc4934cf9db0ad9ebf5937f2660398efe107c81254032. 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/QZFZ62433721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73814f43246715195c6800846bc95fb5fb60f75628294fafab89d56233403599. 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/QZES92166430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0099c5045e4387d91a8b1ef0251aae53ce1471ba16deddb26dad2c0fe5212a35. 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/QZWFU2456224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c96b321eab19e5c00d7399e430072534e46d87a8bb6ab11c7d661b1d13d8d47. 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/QZZ7U2464426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87c0d34875acaee15d03dadd1a0b1afd1ab23cb42298a0fdf84e3434e34c078. 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/QZFZ62555210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb5cb76c7069a3b62c3b1a72105f0d907c96e4ef2e60575b5b72991ea9f4c1d. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZES82581633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb5cb76c7069a3b62c3b1a72105f0d907c96e4ef2e60575b5b72991ea9f4c1d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZES82581633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41d276cce6de2c407b7222a4bb9e24e0c32e5045015a17a8da12d6eb8a14189. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHN52513625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe448f1e5ca716f824290dc2b4dfe428557f1a0e670694f546a4045f139b8cc64. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN52513626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0205acec22484b7f63a8a1edfac08f7ac9753218c89081bc2693a63a68468c. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6Q2561831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d94815b70aca0a191d54af0d61ff7f749b428951b62a00232f298472783278. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZWFV2526439.