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 0x1f42c549c8f651ac6dd15a13cdf1864523c905322af00dd8f0b2f063e7a64cae. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6181effe-4f0e-49b7-9d84-661e3c8fb210.json and https://artists.proofprofile.net/proofs/artist/6181effe-4f0e-49b7-9d84-661e3c8fb210.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 0x8c63f5f621ea8a4596846552c005c9bf8a7b150e613ad78c83a5c7bda193539e. 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/USA5R0606901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ffb0ce18f341748d1b77f7186d1f9167c0f5cd23a5e38ac6654679effb992e. 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/USA5R0606902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b07d4eda87b741f9a6036b66bb029fab0270a2506197fe0d9d580ebbd6ca17b. 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/USA5R0606904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21adf2d63b842b42cc777a8587138fd219ebfaa7eda83040973378da3616b2e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USA5R0606905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f04fe87ee631324eaeafb333ba20b843e7d1bc67e6bb0e859ccb0eab6801b3d. 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/USA5R0606906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbb81b5251797001d040534b29b67a2e42a9a12afb67422b910d01c284fd694. 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/USA5R0606907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a002baa3f57b636307bae4ceb6fde9c15cb94ad4cbf2dffa4e1384202aef430. 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/USA5R0606908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b6f10c83b251a83c3198ca8f5ace09e799fce975e2ff41839b6ec19aa53a2a. 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/USA5R0606909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7975a7c4675053db5b7734e7c7b62d35ffd571f05541a67f797cd2b0444a6f41. 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/USA5R0606910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746f958e564e37c02bc0b0884c1cef870bb3f9fac8471c4cea1f56a43124fa13. 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/USA5R0606911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1800702b6e7863ef14168971cd3cd92605da34175c3d0a9ad932e69f121372. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USA5R0606912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d8328f311f483fe70fea98fe2e3ac52abd9e42a583d5805bfadad251c41156. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USA5R0606914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ae292e5b6f69131b3737d19671e13301d9186ece030773f592d85b2d929793. 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/USA5R0606915.
Four Ruffles and Flourishes, Hail to the Chief
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8bc6f6e20e39012e01ed78712434bc26f2e890023f5474d800a4893468db5f. 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/USA5R0606928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ef9833b2df688376d06dbb0056e824bc258e9a95a6d58f40f2c2a758e9fe82. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USA5R0606932.