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 0x03de7437779f194b4144cc485894ba7223bd28e8d2c4f9eb8096aab355b6c2ff. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dd658be-4a33-4ae6-b141-2c359cf64375.json and https://artists.proofprofile.net/proofs/artist/2dd658be-4a33-4ae6-b141-2c359cf64375.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 0x568e7c5e451a3ed1de5b88e9544d446bee3489adaf90c1256125bad2d38aa617. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZNWV2295738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319843fed00e81013ad735c64d609012ee8d28a629268a93921305d264fc471a. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QZNWV2295739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacc4f56c9e4c5b220b78d56bf3a785e817468802bc7258d2dd2e55778c280be. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHN72308976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2434e9a6284ec594bad1a75422d6f26df3d4d0bb113f1efc602463ceec9a556a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFM2489609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc666ba0eb3ad66a5e9d24042cb0f298ea5450d8fa92b2ec594c4e91bc60cf723. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ7L2433238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9544dd3522c0894ba0ad89055d301dc008756b14beb0d305b946cc5bd676d6ff. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7L2433239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa833373d6f5c0adb1b8e9f29bc40cb972c6a3830b244953cd25cfd36476cb3fc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7L2433241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed178b7a00880eb392c726fd7b63819abda90e648c841a08316a969b4760639. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7L2433242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891e345c52db5b6c2e506a193a2aee0cb80c6f5f2c19d8a46a85b170e0a66600. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7L2433244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873e00f92268485f585ab3d9920421f03d9e6f9e8304127d2925b8d5183f849f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ7L2433245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69594a27c7f6d3bf845554bc22803b4fe99e894522e582b99dfa8c8e667d13df. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ7L2433246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa6530cc42291cbd8c85fcec5cf5d704a5977f8b9170c3fd6d7071530168fee. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7L2433247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6648c75822a05736c023eb85b0a9935e7a4cf7f05be31f27bcfeaa40882b20. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QT4K32562732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdd4663c6d58aadb0756aabcc096c2065068fd9d800799040341374b70f3a68. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT4K32562733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9ea7f0cced05220587cb5c6dc273f675cc54e16450065242498944f4e5065f. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QT4K32562735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c15d84c2e61b9f7935d9e794d835928109b2e3d3aa32218be176cd7a8a533a9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7S2518161.