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 0xa17d3453b317cfbf266130d209f57972a1b57404e44908720e517f8a51bdc8c5. 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/1140ff11-e029-45db-a47d-18ba9b609f05.json and https://artists.proofprofile.net/proofs/artist/1140ff11-e029-45db-a47d-18ba9b609f05.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 0x7268831d2c890bcc99f8e4edb14272d190ea518eb8bbd1ca9a827ebf2f98aef2. 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/QZMEN2299770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa64a0af2c42fbacd85127436078a7ad8a66e7d30a264f42176da1e91aa9fc43. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/FR9W12463189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec75b8d83277ebacfe6c3607d281dc7845b754fd52532abaa9cd6425a0c5ab1a. 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/FR9W12463190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2987308b0c07941aede37b105be4018d402eeee3da049191c46cd5229f5e1d64. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/FR9W12463191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59596d04780194214cf6f61c3c79b44dd74a7c748b19db6435d5ff6163b18b43. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR9W12463192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64418b0348d619a703523c54d43a7c5e47e330aaf6a455d98d1a20a726b7f35. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/FR9W12463193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ef17f0d6cc66e0712dd2a7f7d3865635b0d1c918c0d5293447ac5efd17a3c7. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/FR9W12463194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c763a1da3bbd6d2a9e901bec5a84e0c7df47ef500af5abc659b6d4b9407c99. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FR9W12463195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be2fe1e0edc757f337ba60eeb967e42a418f9c914a16614f99a9085262937f1. 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/FR9W12463196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de47a2b99d748635a212ca37e1852759118b73c3db785852a7e24c41d25ed27. 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/QZFZ72205951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086b895c07b21c6d522810afde94588711673f916046321d5df4a149db5a171b. 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/QZFZ72205952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271108598954abedfde9d66dc35b5e2c78ebace1fbb6bd3c76ad36d5550930de. 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/QZFZ72205953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb437da12ef1c04bc6184eec0ada189604a45ac525dd9cf252f153d0017ff661. 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/QZFZ72205954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe3bd8209ecfb5c701ea78cd1848afa71c6ef674dcb34fc4cd261b07e729e5b. 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/QZFZ72205955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e287ccccc6a76b409bfc7fb01d017a322a7b82c4ab36590dfd1029780fad60b. 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/QZFZ72205956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9269e05861017797bbb7a289ef0d11845ddd92da0aafcbaafc47eeece22d9c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ72205957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14098b5d963b98e10a1339455944940f522202373a64dcbbcfb5e64eced2066. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ72205958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc699d161858c503f9f5b190d87cd3b6a124e8526bde0f8cf64df1111bec6d3a. 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/QZFZ72205959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a028e941804b01d537283f36a68c4f515665fa23b41854aa4af661b485b73c1. 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/QZMEN2126148.