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 0xf083673c18b84eb49b0c1906e8a820399d4dbf033c6e20cfb872bf6c85897e34. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab1c992b-f70e-432d-a147-9e0dc384ed81.json and https://artists.proofprofile.net/proofs/artist/ab1c992b-f70e-432d-a147-9e0dc384ed81.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
In Die Stille Kerstnacht (Koor- en Samenzang)
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 0x86718868cae184fe576498e5d0df651099571d2a76aba52536d18d7b105b043f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NL6DL2200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadac5b5a8bc1b2299f0b112f56174aa4d2cec0bfecc8c51d6af6a5e2a80e3aab. 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/NL6DL2200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51bb804e66b5c259f2213812183a98d02750fe9a9d12ce4e20167d4c65657c4. 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/NL6DL2200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6585344a73c73fde410b86ccaa14258e041cf2f36093f68b3594f9175332ec77. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NL6DL2200114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e2fe8c809a7e71ad0d0a9e938c839bd6a724777b6b5c0a557026b10092238b. 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/NL6DL2200119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa42548f826c4848cbf3e9a9bd28f5590d77187f833d877b90c0c1fcecfa0ec2. 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/NL6DL2200117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba262938cbbdbad0d997121306355f74a6a3c1af57f5391170d30e00859d7d46. 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/NL6DL2200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b9e7d040179b5557f572057a7d81bfb439fc02a7d93f3c9a4ad72d86625bb3. 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/NL6DL2200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedc8a20ecd7314f36c8ed7fa91929a3ac00111c1e4594611ceb3c7cd3111896. 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/NL6DL2200118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe6a9bd4d70151712fdf63f5d1ae7efcc0b2ad2dea1308c08df589d169d22b9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NL6DL2200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4149ddbaddd4487b07d718255fda0d492e9f00ab8d011852f79f4b19ff81db5c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NL6DL2200120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107eb61b022307d6e290402cb1a7515101cd8f21e50982235af0bfbaaa184134. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NL6DL2200116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02b1df6ac9632476ae9f0381727d6b512e46b0c54c5f95306c2d2d5da6f48be. 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/NL6DL2200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0083950b24e1825289009880705a938e450de6634c78d09e53531760ed9c5dd0. 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/NL6DL2200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16c54e9c61bd15d1c2198ee2f19f349c8dd63fc9fe33208c00be710292067fb. 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/NL6DL2200124.