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 0x83dbdf07e518c79a412970c7c498f2daf71e6f8142be07bfefdce6a8dca9a033. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/218588ca-5176-4d57-84de-0f1cf9c05056.json and https://artists.proofprofile.net/proofs/artist/218588ca-5176-4d57-84de-0f1cf9c05056.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 0xd1e8004b914a10c168cbf3bf97a21a0112a5bfc6a489515fec8e5c57d135c2fd. 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/ES75E2502363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe186c349f83f0c5c0a52c65fd38cfc6987862cb686c5ba98b5adf2ed4ae69d40. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES75E2503468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1907ef15ae094de04d5d74603148fbe8ade3f7bfc22b8819bd965283240cc8c0. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ES75E2504354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2989c9f3944ab653b5b3d77c20e29f3d6f183b217f255eb0ff2fd9672236fc9. 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/ES75E2506401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4997ee4e5424dc7ed4f52925598f87475bcc83048786773a13d2ba4c1601f7b. 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/ES75E2506402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8feb1f1b5c474f6be7d12082bf8323834c572afde4f1aef0189c78752bb257. 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/ES75E2506403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d27857bcfebc3e6908813079f63b0f513fe2b251268a44a47f74b2fa198d039. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES75E2506404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4de11152ec5d553250dd493214ef6fa758578032c0d677044eadd73eb3f01f. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ES75E2409524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da0516852c7c8f73fdfb4d926001e54a89219c02d92237109adb36fd5c73c0c. 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/ES75E2506405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1907ef15ae094de04d5d74603148fbe8ade3f7bfc22b8819bd965283240cc8c0. 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/ES75E2504354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9ad9664d8f9a42e3c9bf1666ee9854442b6e4b29136b2be79fb48222f2e22c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES75E2506406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e8004b914a10c168cbf3bf97a21a0112a5bfc6a489515fec8e5c57d135c2fd. 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/ES75E2502363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b6a0470147113cd3eaaae1f47618743bc39d7cd5825ae5f8f3bfbd287657ad. 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/ES75E2506409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb663b1d592509bfc7c8a62a878c0d938d490e8d9511696c1a3c66776f7fa6a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES75E2505004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a053bb5f7d2f6c74082041564fdce3b6ff48ed7efb3061e400c14c09f71b24. 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/ES75E2506407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6ec9ba37fb441a09e65404e1600a899dd6eb147720e86c7e800fae867b426b. 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/ES75E2506408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837dc29ed940ac2f9e6b786c76328de758caaab6da1d867b9c9f4a94529de14c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ES75E2510688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f0df2805de5291990fc89f528ccf008fa358270489110ac815f75884ccb24b. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/ES75E2510855.