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 0x838c2d31d90599ff2e7c438e6130974b92c5ad037c538fe51f4d774151f7f82b. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce4fda3a-d65b-4cf7-bf20-e5b16cdb1efd.json and https://artists.proofprofile.net/proofs/artist/ce4fda3a-d65b-4cf7-bf20-e5b16cdb1efd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
9e Betuwse Mannenzang - Niet Ritmische Psalmen
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 0x61131cc7675810ca769dbccf823e8219d16592187eee2cb7dc56269f08e135bb. 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/NLG620617326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49218b18312ac6c59ac0a8d2d3c2bb88fa349e79dc9bc46f94ccda54553c9c02. 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/NLG620617327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8759ce61f7d9a0c941644d4c4874a62c0624f1620041a26f652601f625504ee3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLG620617328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529feab2039f9ba04097ec0efa65090337380def1570339cb06228a531890f28. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLG620617329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5994026c8937990c5072eb1bc0267617adcd344e53bea16ee8f124e1e16147a. 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/NLG620617330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a43a4b27a7b9ccebac830e6fabae93d1fc837d221e413aa58b3e7b7882495ad. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLG620617331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb598273cdb2c6716180c5e3976775f7dbac1bebd26b6c0d5d6ec77482250c372. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLG620617332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58ea6759f2e7199a8045e2d21261aaf367338a20c3112dfd308b14995c6b315. 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/NLG620617333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34a17d258fc44aee9d7bfd7156e7a9ade303c342e9ca328d7f9847df2ec489d. 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/NLG620617334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c75c9b2d37d3ad9a2b93fdc1a1b62b70da05f39d6ede36c9071d9a6a215ddd9. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLG620617336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414678868f4b6f21dac8d3cc5f46b5a1e3b7f238709e7fe6c57167c9d4e400fc. 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/NLG620617337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fc667d26dc6ca158796defe30729413fd20e9052e7fbd61e971384ffadf4ac. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLG620617338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3c53b7958fe24aeaa1561b54e562484e0364406de18ba0a5cc3b3e60b0c6ba. 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/NLG620583296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2110db30aeeff26a8cb1b4dd4ef364d7905143ae640d44023737bc1788a0a946. 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/NLG620583297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d6757a88f0f95a0a4c75c075e570e3eb57538c8b728b5c06bcac8ac281c624. 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/NLG620583298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd867298e0f0f5456a17fbeb82b7410171d5546786b98d4c26bad4ecb165b6da3. 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/NLG620583299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867f39b2c4f4aa03046d316ddf10e891d8bfc8d45df99ace5e4b0f09f90455b6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLG620583300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd721350b662de7eab7336e73983a6fe1d289659b4368f3090f874fda9f59db45. 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/NLG620583301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa09a5e2b728d364d5fa1ddc24e0716113d0fe126554a89846efaab4672a1ae. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/NLG620583302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c223f9cfd4bc1cb0ca19b0661cf2f2a10b92219b9f75a5daf291ce87b5beeb6. 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/NLG620583303.