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 0x76cac4658fc834fcf6d48708b90a4c5f17a7c447daaa17b090e83c3f357cf8f3. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be325ca2-6925-4099-8f4a-75fb5febeb4b.json and https://artists.proofprofile.net/proofs/artist/be325ca2-6925-4099-8f4a-75fb5febeb4b.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 0x13a39c216d0070976c9f844a48f6e68dd3627db942b28791124f3f64473e3a57. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6P2247557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e0f7a80080e33ea097e5a46f7f0165dd05030468d143f1371214f14b486662. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWR2560866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d29d9f008e23621058e58b96fa219a5df5ac7355befbbd77190497e58629f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNWR2526107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ea4ce1c48dcf72ccad2b34ffc41700c5ed3c83f40a37dc52e77af19892e891. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWR2526116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620e41187d3e68793d737a1e98c855e122d2d99abbaa3e1fec902adb030eec97. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6M2514873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ede3675ccf020cb529be7e332a2aa91af20e5203a1529e6285dd129be6554a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6M2514874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e31b590504265710f075baafaa1a270063e53679874fcd2bdb1849203ce914. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6N2559114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ba874ca4c3fdfdb3afb496589ec2790371c9d3d3b3804909fc28daee14e315. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6N2532379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bbc4deb14eae7c3de869b081e694b0f81fd24cc94272eb932a89aa2903b22f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZK6N2557216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2acc17cd68b2cc63cf201493c14991407784c1ecd26ab6305347a0fe2fc30b22. 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/QZK6N2532384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe159c02907fbd29e13fbf761d26d11c82ab52569a40cf8393cacd4d8ae5f9c. 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/QZK6K2300473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341aff87a3c536cfdfbb31d22a95be7e1f2ccddbc00f1c10a6ab63efdc547827. 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/QZK6L2398882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c285f0a30ce8af83e38630c1fbcdd906b468b070f662e6e9e37a786d4e49b1. 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/QZK6K2300574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aca598ddaf1d0846c9cdc247ab0b4ca0b5f2f68cf9ded67b2cd485d51d00c5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6K2300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99ffa92ab4c6548f6e42b65a2386763227810bc090315c80d5e4e4f464a2c0b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6K2300552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36176d05abad310a20a304f18f8ae0157bad43d3f7792b29f1d663887b544bb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZK6K2300530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789ea05c5ff89026d144b89f832debd6aa8e732fc20641a05c59a9523011c970. 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/QZK6K2302580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2be280b3eb3f63c16749a9110a2703487738c9f66dd80f131469197c2fab72. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZK6K2300605.