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 0x502f43bb7964dd35dec200ac798551f6435fa56f2a5461236fc4de48db1ef3ce. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e134b6b8-444e-4578-9db4-8a2b31ae7c79.json and https://artists.proofprofile.net/proofs/artist/e134b6b8-444e-4578-9db4-8a2b31ae7c79.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 0x1f99fc360115badc1cefee8ef1edd378df5b6e7839afeea60c8fd996aa828be2. 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/QM8RQ1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619382c5dcbc6e6c24bd1c7b0f53220d9f8bf27d1b6af0e6ecd06a1df3932dd6. 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/QM8RQ1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcfab8b8f92ae895127a985feef2499095ab31df3d26b725e12838ddd89f879. 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/QM8RQ1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a5eb8bc8984d2bd9ab5dd552e1f8bf3cba91b0eb4f06a2904c99ccb35f7d45. 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/QM8RQ1900017.
Cello Suite No. 1 in G Major, BWV 1007: I. Prelude (Arranged by Edwin Huizinga and William Coulter)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5e5b7445189344e0e93e9ed4477d17c874444fc9b393e357385ee11b10940a. 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/CAM371602155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cecc77477a00c23c6266f699a61e7aa6d647f48737c9ce8512ffc34d205fd5a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CAM371602157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa2fb4bdd681e74dc8d38fdc23456a6258b9de8542f997abc23779b97d1cb00. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/CAM371602163.
Acronym: The Battle, the Bethel, and the Ball
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca469d15e0852e85753156ff7409e5bf546cda82f621ff13563fbed095cac290. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM8K51800084.
Overlapping Halos: The Poetry of Hafiz, Selections from the Gift: Poems by Hafiz by Daniel Ladinksky
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dbc61ad094d5e679edcc3c3d845568826bd5a14a60b163f509ebb778f0a618. 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/QMEU32206525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba795d684f2866a8e53afc5eb8e5f10ceccb12c8e4a7534183ac03d5365dd43d. 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/QZTB52278229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee44aa4dd13a2acb97f76c98ba10057382c991d2683c4c633520d876723e971. 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/QZTB52278230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccce0228589d314462e696950f3ec31c36f84b8555aead7c07da2435e45a18f. 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/QZTB52278231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2baa8e8205fb899861c7573d537cccd9eb7520ecb5aedfcf08f70e3a4fccc7. 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/QZTB52278232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca02dd0e9fb3804ad9b6251029ee79a62dd20debeb99901459a05049e60bd53. 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/QZTB52278233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b23eab2e9cabeb0f5fd41a706287d4ff4df19502966d37c3b07f8d100ce98cb. 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/QZTB52278235.