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 0x453030d10adab843caf9b7ff9f326c85884ac25a97d107e451681fb33e570a41. 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/9e5fcd0b-cfcc-44c0-aac7-8b9a6f47dfe3.json and https://artists.proofprofile.net/proofs/artist/9e5fcd0b-cfcc-44c0-aac7-8b9a6f47dfe3.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 0xc443a52a2f1a5c30c515eb1a8a2d0e761fa341e6f735456348a6f11ddd97c144. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRDPA0600066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964cfa6e2f6107e436f56acf0f101dcb1b186f0ce47c77f7f2a2648e8647955d. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BRDPA0600067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64e45d3673b448b4268d23cc74470061a0d7ea24d58a7b68f5c16a8f690487c. 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/BRDPA0600046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9bc893d35c2c70b6539dad0699c4111ca59e9dd697f6ca157e086630b43fad. 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/BRDPA0600069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca8fce3f5e1479381db04fe0755ab711d009703a622552156f968998feed258. 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/BRDPA0600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cef2d70598ae42966984f2fd4778f0bbd66ecd68077c91b51c1a3e058bd6605. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/BRDPA0600070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1561ed6e4a7d1826d5d784233704940ed4100f0226ba516e3aa1d26e60146059. 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/BRDPA0600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e0463cbe4c45d66a605d6202e443c80038f5562ac2effd0df51c081347dee1. 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/BRDPA0600074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f87c47a613a73502c251bcf1ac5bcc8d7187d2fc6da2a367cce5fff544f3acd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRDPA0600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7370b75b5550fc2a0f9d66bab53b99fc2dc4e3615d12fff7bf97e289c1ac45d9. 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/BRDPA0600075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5a94ca68eb51d25e606d0f644c1ce211d693e0c90e1ccb94380db75c41d739. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BRDPA0600077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcae6250d4b434ed277b82ee634c9b2e19313feb31f97f0d8a810f865b03df1. 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/BRDPA0600076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebedbb6946cafee61a6eab1c6d9efa21b348fa1b334996702eb1a4cc447b9ff. 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/BRDPA0600073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83210ba3318ac2a3f4e1a5d1653f489b80bfc5ca6adf5213f5cafbbb04f558b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRDPA0600078.