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 0x7ac18d311ce24e9a8be8b2d660571eb65f7404a21e10c92244a9dea94f002551. 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/493c66b8-fc2a-44f3-adba-2c372076894a.json and https://artists.proofprofile.net/proofs/artist/493c66b8-fc2a-44f3-adba-2c372076894a.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 0x90833df28bbc70ecb860d8ef647579cab6e1d980a5cac463537439bfb7af0b66. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CH6630274301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9120aac0430044261f14454c4b7241096818eb02c4d6c1c5e3f5ca44cafadc2. 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/CH6630274304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ba2c08fe80e8a2b3e12daee27320f0d887456e50a800854ccc2c249ea2c340. 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/CH6630274306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659ae0a9a089ac0c7c00559ef7aaa4b977deb0789380af50d376fa03e16350fd. 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/CH6630274309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa330809615f8d72dec3d0095505be9adc187a1f6f6d32d6b4536898c82f7a4ae. 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/USA561326678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23efd415416679c49c7c0a91eb4a6d6592a0b0e4199c4f79fa4e4419a2f6a351. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USA561326679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d50df267da692f66d9a3c227d9d3fdc088fa45ce9456605cc29a9ff762d2ee. 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/USA561326680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc1fcd52f7c3ca5213e4b58dd48a6c5949a24beec6f6c3d7ab0270336df1c8e. 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/USA561326681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1553f5376c2bb5fb0332783edaa0f9e754fc808682682ee52e0306f2bb4d82. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USA561326691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4863a9c0e75af8f7c493afe75287c4c68dfac7bd307dfceaec49cb3954090878. 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/USA561326697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4943a7f7097acc684f01c847c7fc78003f20b656cd0063962e5835a8eae5202c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBLLH0916602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b8a078cc43cbe63ea0cc00bf6bcd182090958e220a393dd232122def69dc67. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBLLH1019603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd709d96eb3d5256026117e7ae9587ea1cd23d554ad0dbda829a807c12c10b842. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBLLH1019607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbc1d7308eb35de53012d9e5c7d4b6486f1305d03a7d8a49cdb0ad02fc7c042. 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/GBLLH1019614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab888e29cf35228869f9f7e19080701e3190c5b7b128ca7dde68f6255460d781. 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/GBLLH1019621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17f57bd16843870b185b59d6a53adc2dfba4b7aa8f1c558501e1e789dce4ee8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBLLH1019625.
Oratio: 20th Century Sacred Music from Spain & Latin America