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 0xcb92bdff3bb51c4149321adf3422dd9e1b8498c4aca81f8e96ceb343404a4daf. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/821a54fd-96a3-40a6-8cef-fada57e23df5.json and https://artists.proofprofile.net/proofs/artist/821a54fd-96a3-40a6-8cef-fada57e23df5.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 0x0a88facf6c33583c3fe433dd769a368f22826ed5acc07ebef295510359ccadff. 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/QZFYZ2307277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15083f9051b884e86bbf559dfdb6711d523c32c0357744c77fec966bc6951334. 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/QZFZ72381045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64b06bc67b40703460343ed67c51af3d80aa6f613b176f2607b8c6125ecc223. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZFZ32352938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed104e1a6f9fe461d6b03d3ec9a1b346d5ef47204a3da8122004b7c7473a0e6. 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/QZFZ32306848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce1947179c50a4c450fa7c951308c64ba8e6b3d590fa3b91a18b433850c812d. 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/QZFZ32304168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751f90a61b4bffe9c0db46b1c1fd6ded18af26858e08177a256829b9cd1b900c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN62166186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55dd9fdf7188ed6e8608bdd8a4935d1a59deb12fcc8840d071bb52ea452b29a. 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/QZK6H2098717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76080c5027beb242916c29b2519e70137b97a811999ca339d45491f7c47bf8ec. 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/QZFZ62181095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1273602ca26c1282176009224399ad499485090b5ef99f8882ae8cac82bbe35. 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/QZFYZ2124092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2d53b8c35e3dbe372d6ebe76df5d96acef18829ec7e5fa2fd412a1c8616b05. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZNWR2054623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021a1d75d12a4ec65ff63c8f23aac98d585aa77e9d08bf740e2b9322b22a1f66. 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/QZMEM2037279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f75864333e08f2b972d42c62b13cd7767752fce645e3d654adf032ded2b2e8. 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/QZES82089770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596ef2c6722e0275f78c32a19fb1703c679ab6aeb749deb6a5bbd3b5ac597e74. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNWV2155147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97367d9f9d3136a1cc98979da6bc525b0cd501ca012967e7f8e22232165f6525. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZNWV2155148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03e1d9ed487a41969be6ec4f0dd5a2c7ac7b0b965f5c43147a8e4e23bcf5192. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAW2217317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd17faa94cac4c5471dcd06bc379b34f19a4b0f1ea19862db3b19e06ca51fdc. 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/QZDA52368080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae0806d8f2f1f8867cbbe6dbc9fe69e0ede2c5d757149d72aa6d4aebc73f997. 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/QZDA62324744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f016fdc003d820daeb1d3bf92b3021b07c49b3bfe7395f3c171d374da98bf58. 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/QZTB72326123.