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 0x7d9cab8874d1628a3e3901f47f0be9325e67152e8d09eff2727e9128d23359f1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f0323bd-9d04-49b6-9e21-1bc5fdae281f.json and https://artists.proofprofile.net/proofs/artist/4f0323bd-9d04-49b6-9e21-1bc5fdae281f.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 0xc6118af7b5005eb51ebd9618710db9c0c999cf81cad307ac6f155f93c58e0421. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/NO3OC2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664eda9adcc66315f4dd428caf8a4dca530bc23a00f4b94eb1a17fb781c4720d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/NO3OC2202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f4140c4b71d838fba2bcdaf4d846aa6133610b9b899c918fd659753a8e4065. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NO3OC2302040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65c12c7ecd7cce082e2d50444da6f98e14eb0424d5a3bf61343f56a925a17c2. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/IELOI2217355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835fa73a4346312fc4b4dfa79bea790c41c0aa9e990f41c3c2264c25a8cd5929. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NO3OC2303010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e59ef06b1636a731f5e0a2d575ac7a4887ebd59e9d75300ab3aa844222cd37. 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/NO3OC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad9a41683af6fcda516e1d8da4899650ba7c426aa70cfa829d9d22532b1c1d5. 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/NO3OC2306010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa1635e761b2d67336fbdd5948c8ff4f1972a293c766b9400257460c6eabd9b. 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/NO3OC2304010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce0b4ffc65fca566a22a818fc40c835aed21108efd222d02e3d886991bf7551. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NO3OC2307010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b709c9752199e3024d11d4d57ed9dcd64be008ba13df42a9d8eb20acbf4c22. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/NO3OC2402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebb318b932199b638939ce2415627f9ad29c591e1755c8192518473e60caacb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NO3OC2408010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9821729c834f8c0aaa69fe7a4e158a8183cf446ad7da76689a3966f708a04d. 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/NO3OC2407010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf57006a50d292fc80d91f66ce209f4f8cac852efc4f10624651e8eadd8527f4. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/NO3OC2406010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d65d1377235f4d6e0b1f9ec25ac4b1d11c8c8769c9c06b1d8f9fcfc268147eb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NO3OC2405010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04951e91305d48bff8702095829bf5ac5ce19bea0c293d9402644cf7c09f382c. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/NO3OC2404010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b98d232bec505d90f958e5a70388549066e9be54d25dcbfdefbbd434e48eb2. 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/NO3OC2403010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81c305e04addb8fdf7e1bb619dd142d77f58f6a55e9ef24b7501fd46619d76c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/NO3OC2501070.