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 0xfba8b2f85a24877b589ae53f94f804b299b61176a67baf641ddb13f883e25da5. 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/2efd946b-b37a-4784-b258-3d54b3bef87c.json and https://artists.proofprofile.net/proofs/artist/2efd946b-b37a-4784-b258-3d54b3bef87c.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 0xdf29d2b767750adf8dd176e089f9f5ce046b02939ed37c352605f0459f75bdb5. 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/QZFYY2112103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c7963e7540d014e533b321b227b2a426e32b3e9b0ed6b8a00b1a119f1d4037. 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/QZNWY2155971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc9c8dedfd1aa4d3e8f2a306d1c4372ffe5e85429ee247bc274c88d23f015b9. 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/QZHNB2311078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7efea2b495647ed7c57c8137bbf5ebb8b5acc138a33a7be523f2dc79ca58889. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHNB2311080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b63916e4a3a509c64ec9673ad0549c10dbe3869bab92119d267758d8e31ff42. 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/QZHNB2311872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039c2b6ce9aef3bf0012b9e9b3f2f5ff0e6f201b3cca89e0af5eba5f87e518cb. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZHNB2312224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1246076cb8187918e9fa98bb9cecda399bbc7c37db04d98bfcb58b89a8373cd9. 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/QZMEM2363031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00279387295ea02df4071fb0b23aaf040d1ebef9024b66b4031494da220efe13. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CBAUX2403101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100d4184ada0393b7ba40950658fa84c6cf695e72d702157ea9e279b9dcf2d54. 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/QZNWU2439773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a75035f88113b026d5d2b594d7ddc9da040e9ade532ca72e53a5c894512f020. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZPLS2471522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782d4cf932193c1f34c68b13572eb9b0056072c1b5f924523a4cfc836eebd0bc. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QZTB72466857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe414b8ecae8b2787f0aa0a854a179c6c245535befdb837c280ee6c9f51d20b0d. 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/QZWFU2418986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb366a1347f9db0b3a913ed67c1de4b81db75b85d670b500e797e53c4c090eae. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEP2568109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560cc5484cee73e66a6233559ddb8fe02738e64375844cece3b10adecf26883c. 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/CBAUX2302306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e21543028c4f1231d4046341bf3e31565bbca218e3d4609f850a4282586704e. 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/QZTB22328019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadefe9f4dd0ced32257e238f34d58feae431bf26c83f7f6472833db5b9c9e35. 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/QMFMF2224845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a94a81f8fef3c272c67cf9b292cb163e9621c7aa8e49bcda23b9b8805d927b1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKPL2138352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0c715711039d66a22421aea37cad5ba9d2fa2b141049de628476e4c00b5d81. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QMB622116305.