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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5128e31397675c1cd7dc3a37520d42378e7e9a0960641ba92ca8540d79b9f87e. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89bcdea0-7164-4b3c-ac2e-81e322282509.json and https://artists.proofprofile.net/proofs/artist/89bcdea0-7164-4b3c-ac2e-81e322282509.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc74e30f5b5384f3a4e666ecc273cf0931ca592202e6add21055ed2cf012d454. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:47:47Z), 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/QZPYN2362623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8c33ddbfaa21042884fbf0f1e974994a87dd9a9ded71dd6c0eb29243a9af44. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/USHM81139530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30211b2401e52acba37ac56ff031da8e330cdea38868a6cd0686de7258bc613a. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T03:22:57Z), 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/USHM81139531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50455667f90ffb907b72b3272338108de0068a0013e373bf0bd09d7c4c0960b7. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USHM81139533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522ea5b74613c7b081ff0e7c26a536c274243a5311b07ad24c6bb63c37305cc3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USHM81139534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8df0c70a55c20c71e9742443894634e759004518e57d5dfd373039b09eb839. 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/ESA012287861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01b2e29faaf7889275bb4f8bb3565797dee461c7667df21d421a3ad2891db97. 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/ESA012287862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6844f5d88bd90cdd04a7a5f634a357e74ce1f601e4ad4209fffaa42e2ff7c8f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ESA012287874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edaa7a0ca9b62effa8964765d8932d4075e825a2cb3e91702b5b802265bc147. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ESA012287882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77f03296ddae932cf94ae9d8396c3d1e869c43ba4d859c08579bec21d83ec08. 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/ESA012287896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc85b96b1e9cd9d17e56ad0dd0565f1ce04b106b2b0299cd519fbb9e274c060. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM7281747237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800ac2ad7c529391ba177fbe23044798e5c3db11d3974b16a3a736f87a1917e4. 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/QM4TX1838755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd56e447ccd43ea5c6caaa35743e4fc98cc0722ae5bab5b3413dd8afb2bbacdb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM7281747403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4772458572df77c945791f24e1abbd28e7a0e5c78c4e008fc2d294c536c40c93. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCABJ1287399.
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