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 0x1330c7bff661bfe0fda94a83a498fb7c89055a9f09b056b2a367015e1e763ccd. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/590dcb8a-7e5d-40fe-943a-171173426f94.json and https://artists.proofprofile.net/proofs/artist/590dcb8a-7e5d-40fe-943a-171173426f94.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 0xe1fa5dcb9134fd1bf02d438cbd922ed84af73cd5a6fb89ff8c74dde596f84735. 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/US6YF2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdaeaa10c2c9ac5c16e3d1ca542b53fb131c876f87dab2acf247fa6e806bd1d. 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/US6YF2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ba450411128f300d8d7aac625713fa37da0efeacd48ac938e43dd6c0c1ac09. 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/US6YF2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8145c42cf18df3fd3724b6f0e26bc05bb62b441d10b72c825a99e0e3c82ab0a. 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/US6YF2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d62fc47328a81ff0a4035c9552100dc6080f2466a0d0977a1ff26de5718e7f. 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/US6YF2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0686aa11bc2262b344b27d36889dffd3554a5de86a21699d1b7f1f7d7e4360. 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/US6YF2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24afbf11ca6e41383564242a625b0f66b4825190e4b98e2119ef4cdf55d58849. 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/US6YF2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc14aff9d0fd49d233e4005e34eaeea40f50a0aaeee40a8a3fccf4bf249430a. 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/US6YF2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af1d457eb6354faedd8d74a0ac50571f47807a67a4481dd4fc88088ad591150. 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/US6YF2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda20e2b5e889db823778387c8b88d16affbdec9fb894bd117c6bb73cbb6e56ff. 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/US6YF2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfb2d5a88dce112d4c928866a93800a054e74c4d1e88b83f5c68b91b7e5123b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US6YF2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b3bfbb23082215feda9336c9db4c7c3273d821ff1ffcebebb211e2941b5290. 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/DEZC62146171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec7a540cf94710c828b634734bc93855d6f5fccadefe476443eca5d7a44a11e. 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/DEZC62116409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0084423eed6d6336891fdb9331062b147f9e27c951154e1f519d4a53952283. 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/US6YF1700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2ee053f95886dd6fc60e81e0c20ce339588b6437b3290ff793af935e0ee236. 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/US6YF1700045.