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 0xaf8f860722e476a7590e95c4fa58975600f17e19d4b130efb2fc4beaef1724b6. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/281c91cc-c78e-4cac-8752-628a6eef20a0.json and https://artists.proofprofile.net/proofs/artist/281c91cc-c78e-4cac-8752-628a6eef20a0.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 0x5f20308a2f2f2e3fc70156418d0a94213afd13c92758556e2761c7682a1c3f65. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBRKQ2367937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf343f43f815eef11825f5c296fb0081f2c45b34d4fb93d1e7dac077635f7ff. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBWUL2370768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da3e06e478829a634bb0c37146be81fc894f18c456c1bb937033a124a660a83. 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/SE5IB1600138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d079ad3c6e2507e283b538a2fdc194e45b6b183c76f20339dbb096a1a2181d0. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE5IB1600137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b79059b70a85e1ab9bbc4d8f7713188de6625bc7c170f27ff3645d5e07c8f8. 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/SE5IB1600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2ae4bd52ecf8a9a0bd3a6ec83c4f9926be51dfa336161bd108ae9ea4bb0c36. 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/SE5IB1600135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8598f552807fde17aa859cf54f102430901d48283a09e08f0ded2ffb97c8fdd. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SE5IB1600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b79059b70a85e1ab9bbc4d8f7713188de6625bc7c170f27ff3645d5e07c8f8. 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/SE5IB1600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d079ad3c6e2507e283b538a2fdc194e45b6b183c76f20339dbb096a1a2181d0. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/SE5IB1600137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2ae4bd52ecf8a9a0bd3a6ec83c4f9926be51dfa336161bd108ae9ea4bb0c36. 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/SE5IB1600135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da3e06e478829a634bb0c37146be81fc894f18c456c1bb937033a124a660a83. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/SE5IB1600138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8598f552807fde17aa859cf54f102430901d48283a09e08f0ded2ffb97c8fdd. 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/SE5IB1600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d079ad3c6e2507e283b538a2fdc194e45b6b183c76f20339dbb096a1a2181d0. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/SE5IB1600137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b79059b70a85e1ab9bbc4d8f7713188de6625bc7c170f27ff3645d5e07c8f8. 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/SE5IB1600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da3e06e478829a634bb0c37146be81fc894f18c456c1bb937033a124a660a83. 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/SE5IB1600138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d079ad3c6e2507e283b538a2fdc194e45b6b183c76f20339dbb096a1a2181d0. 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/SE5IB1600137.