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 0x9d4ee22700a663685fc8265ded99a413b0ce68a7b5a8ffc4b873d37cfd4f537d. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1e4a099-7baa-4a21-9dd4-665f4f02e9a4.json and https://artists.proofprofile.net/proofs/artist/f1e4a099-7baa-4a21-9dd4-665f4f02e9a4.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 0xa46ed34810dfbe6d4c508a62ff3388bb7c1e7c257c76a0eedf93c3b581001a33. 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/USUM72218690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443a991b7745ded1cea8717df5a067513e629b4edab472137558d433118ea88b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:23:07Z), 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/USUM72222386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35d92db8b05bf998aceabe2661784ef645240ec46e5058d8811420131757375. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USUM72222699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5705bbd88723e37f10e705e82d299ee5fef0d2738c1687605d313c13350e9403. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:06:09Z), 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/USUM72222703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d06a34562e02956d56904b0c42d8b1d9e513205e825f0cdba356253f832330. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USUM72222700.
Unspeakable Joy: Children's Christmas Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac407277b6a1ec36e27f9ca1b7a50ec9c3ad3182f6d5530605b1639d250d57f. 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/USUM72315140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae93e41f10e2b28bfb2477e510116bda267635b80832137f8a39e832d8d1827. 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/USUM72315132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8e985408c721268642ed38aadeb7a75c35e36c8eef5cd603fdfef69a4292a4. 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/USUM72315134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d57d32cd724694851f6ead5ab6f64152e8d7c84f3cf1764b1149c422b696f4. 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/USUM72315139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951e57ecbf0c418e60dad190667678cde44803eb07fa6b0bf71fe03924bea544. 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/USUM72315133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da279c9eb9ad277392aa0dd93db3d4a06e7f4f9b066caece79a06d5a420c684. 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/USUM72315138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd117c281436e8bc9275b42b088caf9cf102828d881c5e249886806e7d45d03. 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/USUM72315135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17db2c80cd3c793a3a28de68d0016626e57eb4d1c5739cbe0d7632a58437445. 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/USUM72315136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468357c163bab0d25d86c457bf33499e1006df79af05a0115a45275727e1373e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUM72315141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b398cd9005bfb8b273b181db099f95f552190a2e00e4f6450d6115d65e8e29. 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/USUM72315137.