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 0x4d2e55d177c621810dba8869d9cef42e00f01c1f8e0a725487815710cb20dbac. 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/19eafc12-0637-4da9-961e-b3c0e8609b5c.json and https://artists.proofprofile.net/proofs/artist/19eafc12-0637-4da9-961e-b3c0e8609b5c.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 0x05c5e6ad15bffc1f7d1af6fae3ebcb1c721e3b054d2b95a79dec44d1952423b4. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZGWX2122499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69e11d0b2cf93f04448305e9d478f9f5752f25969901e9e468d7812bf519df4. 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/QZGWX2192425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc499947688670f123e1bdf2d88a37c5573a2511e658488e9df9144e69441693c. 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/QZPJ32131982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b09caae13ac81ca9adb868f51e9a5fd823eeda955c78e523ab880e47f8ed76. 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/QZPJ32131983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf7e536bd254aaf0fcf9ea84dc1c23f08377ae97e77af16840e6780a0b8e962. 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/QZPJ32131984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fb8ba4d5230cf1ba13f7a0caef94f32ba0b695af93cb22e62bee6b040f6cef. 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/QZPJ32131985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5599ae2a361c37d2b5526398dedecf61038cd98ef44a8a98dee02454b8d7cbef. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZPJ32131986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d7df4dfbc68b9bcfdf1fa7b8d6d6337c06fe32fd5e59d0d1583d202b490636. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZPJ32131988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9761dd17f607286d15c86a7fafbae968643159ba0d9911e3e8f1d3bf4596474. 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/QZPJ32131990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09adf12d13da7dddfbd0474785b56eacc5ee2c1e6878e5bf2ec1f59f308b27c9. 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/QZPJ32165083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543b34e837f55b5afa70c8d4e91b7f2fb53e28d3a32e01a64104cdacf9c25161. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWR2245277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c24c1462e81b22890e9ca406b3d4deb08352369877be3990ee397cf281a039. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZTAY2354291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe7bab5bf9cd0bebccc1cab2d03d6c795218910296f1fcb532cb5d6c8603276. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZTAY2354292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d53e85ad0be64c9cbdbc81df93cb8fd03efcb39d9843ddc8a9ac8700991177. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T16:53:05Z), 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/QZTAY2354293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6490d6f3a41e34131860fad685e886a4319bb300488d8021f5dc503c69d489. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:20:52Z), 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/QZTAY2354294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76303b553a157641a933bb22a55ef9945f3a5fecdcfe66a51a6c93dc16c01edf. 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/QZTBE2418094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dc65d33c5ac1f626cb6c4e1ba6011a01f441c3627625145dbaaedff9725ac3. 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/QZNWR2545132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649985f95971a0fe9c23959ddf4179635b137b1ed4ea41d06b3dd2ffd924bb4f. 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/QZTAS2571245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bd5dedf52c15ad9e03eef871b521daad6123fa211e803458bc080b517309fa. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTAW2581431.