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 0xd897c4cbb50992944e5fa492c3cd419c70a49caf9c7c9d56790f46efb312f321. 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/4e799398-05ea-47a8-958e-e78489d24af4.json and https://artists.proofprofile.net/proofs/artist/4e799398-05ea-47a8-958e-e78489d24af4.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 0x85fa8b65e5c9d3e32444cb9320def2eab47ad57288e40b4e547b64c797aeb340. 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/FXR142200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d42d72a67b8d81e485ef63270906516af2ba133394aefecb217ce43feae476. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:11:00Z), 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/FXR142200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401588b8b9de797dc9e7a16f5f31410de1fcfb4c27b1c3ad12d77198a1425912. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FXR142300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d156c44ae90c6c42506051c65dde5054271165cdb4d2e45224b8427892be808. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:26:07Z), 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/TCAHO2396618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2a16e307f6912b05ed336a8c419ed84670959342d162521c8b53f90b0176e8. 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/TCAHO2396640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336225106e9aa9a2d5118f7485167368264417827d281792b6f87df68fee50b4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRR642400975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336225106e9aa9a2d5118f7485167368264417827d281792b6f87df68fee50b4. 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/FRR642400975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a161599b5181f0ee754dfef63ebf78f2e1f3e22af41969839f604f83015d1ab. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FRR642400973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9c56d483123a71e287220c3a7ac5e5d170fb557e3ec9b3ce068495671bee13. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:51:12Z), 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/FRR642400974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bc7498bbc92d16060ebb2d03e53d6f59df3be48d9fd5eee8db21dace7cc536. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRR642400977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6ac235c4127f77a0215721f1f79d9f272b1b9b18a39e50ba78ba149962323a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRR642500199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d5d198bb83bb0e87db4bce69dedd3b860e3201c83b1731c2ea3330041e7db2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FRR642500200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1d386cfa79479340e3f812a1a83bd7cd3065d9396cef7641e1f5697db24706. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRR642500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5679503c44770aee60ca7588daf1e92daa890417d7dd13904965465cde3c99d3. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/FRR642500944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aee89c7d36afb73cd1ee138abdbce0bac8ab326621ba0775d0f73475468aec1. 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/FRR642500985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf200a2e26a517b336ea94f8386bf5c51d967507c323048a4799ba87d9fe28eee. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/FRR642500986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5679503c44770aee60ca7588daf1e92daa890417d7dd13904965465cde3c99d3. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/FRR642500944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebd7aa774d4c90efea797d3ef829c4db70dbd5fff5c182921599fe04ebb301a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/FRR642500987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd130212606195ec03579e769f1bbc3659ea2b78da318f64891417b1dc33b17. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:01:51Z), 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/FRR642500988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6effc01944f52bb52e834852daa317af322b4da6d055137ac898e399e9602b96. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T08:46:34Z), 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/FRR642500989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1934f5db0710e56e904bfb481e4760029b47d02117925486c4ba5381b17298ab. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/FRR642500991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766b9fccfa81e95f6f8c35fa6dc62db5946151c9df1e6dc3d768045c44ed4dc3. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRR642500993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b5bfd45d1ebb71a3ea61d208a42a235cc5b0e07105a9046280590737498dbe. 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/TCAIJ2435163.