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 0xafd4724afb552f44daa3aafd4a666785c89a1c6c59e994b2ea2a7aafc80791c7. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/992ff172-d1fe-4ac2-999a-135051b7f475.json and https://artists.proofprofile.net/proofs/artist/992ff172-d1fe-4ac2-999a-135051b7f475.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 0xa6787e930aed7f67a5873408f17b1bc1dd9f97fa87656f7f932d0390bdaeffbe. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USANG2477583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1712f6f2016e9f0db5a6e081ca90db1771960df7c50c507d933ae1fe094cdd86. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DGA0L2425499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c4fdf4bc41de8de0e652cbffd856a320bff6d529985635aa8acdb0d846a2b3. 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/USANG2499975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d7bc662b69b37665f20828cb935dff10986f7a62774d6a68c3dcc4969494f7. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM3DF2411083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e6b13ebd261a83ebeb777e19580f549b322024b6538bf62a75b2894bcf15e5. 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/US3DF2502974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8779bddc61f336f6b17131d8b247da7535ef40db3e3821a2b42dc4c702d8b2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/US3DF2534143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554a9f88ae4714509a0cd9d72344fe7ae8c5cd03ff0f76ae5fdd2b351ee16781. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US3DF2535207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652600dedf0b2b3058b37d0b062e8c442883656241d90995757946bb22323f47. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/US3DF2546744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e601bd57f3fb7e0287a23512e5a52d2fb559da4383804bea374b53c46ed21b. 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/US3DF2556719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd643d8b5ccef2b123490fa5acaea2a1baad8df0b9af94a6b705f153cb3a83d30. 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/US3DF2563414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bf14c59d1472d95d0e4d055258e53e7178c51fc171747f3d95bb389b8b9820. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DE10G2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f4ebb56a4f382eaebc31bc582053fffdb767eb01a5e8bcf34006da0eb1b3ba. 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/FR2X42544660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526cc6f24c1a5987be3fc7c1334f897e1b66fdaecc53ff0f03e77cdd9e4d23e1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR2X42544662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7052c01f639a08c7ac49c8e93c499611b64ff73d3c9b1f2c709d8b44b3056e0. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DE10G2500002.