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 0x7dac081a75f49891ecc4990da9fe29377bb235e273c64f6976b9e72fe7bc328c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c56462d-c288-4932-b6b6-bcd5e63527fb.json and https://artists.proofprofile.net/proofs/artist/4c56462d-c288-4932-b6b6-bcd5e63527fb.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 0xe2ae1df635ef496f136b82bb6171c4b7f6fb20d49d099542249c11f72cf5b890. 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/LVL151903388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52311fc922217fd9e52d01071418cb9fef981fd8d972c67896f8d7ad1ff23b41. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/LVL151903387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09589e92879f09a639538623a9ea7e1db57f6b70b4e58ae0dc53bee8d3df1828. 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/LVL151903386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6a142f982c065af85d0545a93bb3b3af7b9ad79c5a109afd9c966f0bf55d8f. 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/LVL151903385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fae11cf876efd66d2edcdcfbcd1e8d78a8986886ed65d563c6da4cec19d5b3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/LVL151903383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620bb410a3aca9edf0f8e55a4d1684b3d956e29f66c8cf94e916509cf0df38d4. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/LVL151903384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7352266fbb320df61ecc3f8addb5f6072c5a06a8298c17627c1b8b3b06d6fe22. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/LVL151903382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0d92e61ac9e8884384ee5412f6d938a658174ab91f1c5734fe9a7192bcee76. 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/LVL151903381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa899e907c460de0e308ea7212de860fa9524b0bb0fa9bfdeaa25ef57f328c87f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/LVL151903380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838f937cc37a33501a573aeef23e4873b363c69294402880b2bbb4c379475b0d. 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/TCAEI1985500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb922aeddd6e8013743418b08d26640e215d7c8260c7158050a484382d42a285. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/LVL151903378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42e97accb0dcf54def11c09f3beb7e21390311521344b3d570deb429042aabf. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/LVL151903377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e924dbbff31311cac9128f4ff8717d40ea74d9929431209bd2e9df1ecc814a. 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/LVL152101965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a169bd96b285ff66576687aeddd18a848a8d4355f724e96124abc2131231405. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/LVL152101960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2990b7b94062dfd4d3ec4bc461efb528a9c1cc738e757a6b59bb0ff07c0dc292. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/LVL152101961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd053814e03467f7f7ea9bdb5a5a3a2fea8c25c358aafb0a0bcc65338651de75. 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/LVL152101967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4235071a07504692666090bd04b5083ccccec93c00d51834407fc176241e1e3. 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/LVL152101966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4946df5be64f20195866746df1445378566ca1082b7ddb4910b2089341532f. 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/LVL152101959.