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 0x415afb17ff94060fb054f15e61d7111e3b1384abb2892d1c62368b00b291c5cf. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d93f4036-db38-4cbe-a9a6-f776b579e845.json and https://artists.proofprofile.net/proofs/artist/d93f4036-db38-4cbe-a9a6-f776b579e845.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 0xa9b39385837cdcadc6415be5f79a9c9c996cf0c8409c78d926e2de50a18fc9bd. 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/GBBNU0500652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45f010673095f7a9a211ea9fc2ef74ad02147b5cc874ce4ba0a2513b6d6e99f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBBNU0500653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9889c160e1cf10a934d72dfcb503ab6def4de67fd2e3203a072809006d8c56. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBBNU0500654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea92cdda4b6f445f9b9a9568d3d6c95cb69c993012109345f52084c280683b9. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBBNU0500655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d837ab21c6cc9ef3360c302e99e5ea054484892660533a055eabf39fc4afe4. 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/GBBNU0500656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f0cb8a2e9c4e219bc5432a44bb54369b7d2236ff4c0570dbe51742586f36be. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBBNU0500657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b67759f8507b87bafe3bc3565ea3f5e1ba7cae959046ea9066d67a71c8d21e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBBNU0500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3861080de0cea4c4915e4e6ddc2bf0f622fa6e951d0a7ee549592a7350beb7f5. 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/GBBNU0500661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08a317448af1a245d44feb879fbdab3f330998a0e4bb4037b483cf457d7b63b. 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/GBBNU0500663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b17188845c0167da72c9f0303e3ec1ee95ae92f5ae3560593a8109afece67f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBBNU0500669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e44e341ba9cc8f83a8f370e6e899473606e5cd066ebd7bbb3328a44635b2175. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBBNU0500673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7ca4e57a10714fc4631faf4e8410e6a1b42489018afb2762b52e488e89d853. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBBNU8300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b67759f8507b87bafe3bc3565ea3f5e1ba7cae959046ea9066d67a71c8d21e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBBNU0500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e44e341ba9cc8f83a8f370e6e899473606e5cd066ebd7bbb3328a44635b2175. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBBNU0500673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f431c0e46006b9d7d6f7ef7668445b67239487fe6186f1954cc755dbadb5333. 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/GBBNU0500674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b39385837cdcadc6415be5f79a9c9c996cf0c8409c78d926e2de50a18fc9bd. 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/GBBNU0500652.