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 0xce61da5f6937884258f2048d4870e0378e114bc616015495de58650e8db22cd0. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44c2f7a7-5c87-4788-b893-5c772853b4b4.json and https://artists.proofprofile.net/proofs/artist/44c2f7a7-5c87-4788-b893-5c772853b4b4.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 0x9785a722b4531780067e2809c6d81237d13f0ed1b76e03bbbb92969d2c0c96da. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/JPW462322135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6095a748e13da1a9b7987a0b1f511d9b56d2408559a95f93c2d4c863ec8a00d5. 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/JPW462322138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e50eee2baf636233cfeae2b927853a6e89912fff5c50a5469153b4e0dab75a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/JPW462322139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3744c1aa20d69cf2f2a5b1fa837ab40cee0668cfa80970a3a9a633d61dac32. 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/JPW462322140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e00f3b8d4be67d3722a2489db18a8f87b61f34f82a1c797911910c58e56ae99. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/JPW462322143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1928b26ef30e307b8613c9d0490fe8a701864073d5fe70a5818cb0730783a8e1. 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/QZMHM2278250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33eedacaa077e5e6056b93013188946833c433a203eb9082befd2f29febafd10. 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/QZMHM2221604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8fc6421fd62e4d63b7408f5755f0b282f906f9d78da8f67f2cf6991cc9061c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZS652213088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4311bb6d84f5aa97c74cb28f28ac4ba915712c7fa2cfa1109ac0a1686ade93b. 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/QZMHM2247854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b2d7fa165d36c8daa34bb9a303223a62e37f2f76da44b31f1786bfcc17bd16. 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/QZS632212455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8447c9c0df549ed0b474c4c213a8f2b1142b490b4ea57021e5edb354d385af4f. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZS652292005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f946f2d70d39af1dc83553570df26c0769679950250b5b73ef8267264ec540. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZMHN2222662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1768ea2791141c1cdb1591c6c1255ac7855214e7f81fca1cf7cde07096d4e1d7. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZMHM2258924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246056cfdf8802043a66706a6134f14b60e07ed96002ac12270a992ad8a03470. 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/QZS632220633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cb9b5e2a8254438ef5e1a32cad706596279025d2300083eacb4a0c2c9ada28. 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/QZS632216369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d9af02dc17020d9a507a8eafe276f17ae9d8b32d499c481dff8f836e6e961b. 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/QZS632225842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a762c717a74a7572ddb7e5c68199b37f0945ed32e2d9e64cd3252ab1321f6c. 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/QZMHN2211264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa239d42d595bbcc0fd4dbcd5fd7720e7e7a02386b60f339d613ab72405bf9a. 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/QZMHK2247999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22222294ade8e024932a0f3470f024ca597bbefa1d04cca61f5cb2d5e66bdbac. 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/QZMHL2265705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98a42fd6b8bba6620935f08b22ff07ccdf3db02a34adbdff74831fe6d5ef910. 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/QZMHK2285471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d31d297999eb8cc12a3f191c089277bd0e8e76632b68fe583c19621b0117caf. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCJPO2158438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4c83e20d42e78df6d0e0e2269b90c134a1ff9d64ddc218a67b44bbb81baed1. 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/TCJPO2158441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49572f2dc108b849688cebfc900dad274204ffcdbfbecb4f9b1eb9e29fbca105. 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/TCJPO2158464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2259324cf3b717cfda66df5a42991d90ba4eb885a5c970fee3fb59466af828. 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/JPW462424811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43eac8635f0eba0d6cc256912b8a4cfe5529a92f4dc9f411e43aa07a32b27fd8. 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/JPW462400304.