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 0xe12e88f9490c6f83eb2577f635bbabab0019cf8af9e7d5a609f4abbed5b9aa34. 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/5191433e-790e-46c3-85b5-eb7fc53dfc58.json and https://artists.proofprofile.net/proofs/artist/5191433e-790e-46c3-85b5-eb7fc53dfc58.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 0x0a63830c3e8689103239752ae1cf054ca3979847d685ed307c0513f9b96e9e44. 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/NLC350512001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c603aefd53129c6f57aaf09c3469cff6c1805da7d18da0136ce7fe010e37880. 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/NLC350512016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed89b25fb9dd2cf0e59d697a5a8add5d4db3a2417ba87b7a4ebe7a4c48c13c8d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLC350508101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a4c91616b70b985a44301007552b111999b76372fc2dec5b3c59c8c7322bfc. 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/NLC350508103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fde8288114ab662e0a60ae6a5c70c6e238590cefed1895448a7b6deac87f2e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NLC350508105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814f067aa1ba91266be9104e974401a24f75168e802a079ee1d4167c28871212. 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/NLC350508108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff91d2179b41656b0ca877a7f7f316304d1532d5225fa65fcee0d7484ed3fa0d. 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/NLC350508109.
Marine Band Of The Royal Netherlands Navy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d1d820970cd8563f675f0aa53923b12b2029542fc2081089b2d08eb42a3743. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLC350511801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52098f2300900fc488974ee6dd64571c2f4fb0ac9bb3a6e36d2f43bc75c60ecb. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLC350511802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ede103a8f8a63d586807842bfe594a183eb0bdb58830a1c26351fea3a673c73. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLC350511810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21aa825a4388d5da86bfefda675ec4bbcae8f72ef17ba923e84ee91a757d746. 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/NLC350511811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101694b78f3dd527a054cde42aede04d5051a0ae02ed74882d4ab92c32d37bb6. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLC350511812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e89a340eaef84860d6c3863e3cb300f83b92937a667a4b38604737d5cdf0c27. 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/NLC350511813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c625230234e16e5ab04f6a1041a51fc796b3d59bd7e3c8a0d9f670a68b42b3e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLC350511816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6ee3f755ae50db9710ea7a43fe90ef15992588e51f4b690da52365c1400c41. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLC350511820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee5e93f2c864d316908f5cd76e4de9f8b99107ee47aedb1dc3dc588835882ba. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/NLC350511822.