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 0x67f6c564325f2902ba735dce875098e11756cafca98013ea2ae157279a9f4480. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c61d1e0d-1bed-4ade-8353-b125e1333142.json and https://artists.proofprofile.net/proofs/artist/c61d1e0d-1bed-4ade-8353-b125e1333142.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 0x1b2333a7b1bd219c39acb522a84a97d5406c54603a3085c22d5c903dc29a7909. 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/USA4A1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86dbcfef5f6dc70b008a5cf4c8ed4fa64d6d4d95f2e29a06f5baff44a19344c4. 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/USA4A1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e61d4b19713b06e1413290554048de1578bced8787de42a3bc447157440e83. 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/USA4A1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36169546c8d8d3c9ae58b180fb632d02989f5af956ff103666890506470870cf. 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/USA4A1600004.
Ispariz (arr. S. Kammen for vielle and gothic harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b8a2ceb89267ae0f0ec2b8eb4a841e71780910ef41e73da75931a530317309. 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/USA4A1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313de7fd72be75501047da030066e4233daf6c95de96447be59503319297ca51. 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/USA4A1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7cbf5cd46fed6825d0c585c1ec277663e4c03bbfd684942d0e1e4508f4a97c3. 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/USA4A1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e09908634f484ada0556dbd3718d956763d10512cc0ed288cad25e247294701. 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/USA4A1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b829f4dcb5c30642450e8849bccaf99435ea95d78711c5ce83c34588f3929b. 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/USA4A1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03890b38524393d7a61cb6cc24827ab1c4284b71fc15de45bcddc34fc92fd624. 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/USA4A1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5f2999bc57d6a816508326f415a030ac66bf26b3e42f8e8203bb74ee202532. 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/USA4A1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5e5b16b179a684d658ed60517612fc1f90d072b06a3e7735710132db2c35b1. 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/USA4A1600012.
O virtus Sapientie (arr. S. Kammen for vielle)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39808a53291349e22b742d073f02a705aacd7b8dee895397f6b95ba19a4a1e46. 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/USA4A1600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb848740aca0b79facf75c804093b0627732cecf141ef649835d45a38e7da412c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USA4A1600014.