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 0xcea711464db1b0701df378b31ae4067580dfc02c701e77ba05fa62ae791fe312. 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/824ff485-58c9-4f51-bb06-08da0799a2e7.json and https://artists.proofprofile.net/proofs/artist/824ff485-58c9-4f51-bb06-08da0799a2e7.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 0x38cf876bfb1ea2088fbefa75c8f4978d3c2ad53a38d0de0625fdcfb17667ea82. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA62029937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa179f13f72547fc6fdfaea9e5cd3cb8118ed47a1e8780be2ca8c09baa386ace9. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZDA62029939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4b5e0619ec30fd2589ab4bbacf9f2d40b36475ea0b7b50b8792616dfa99871. 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/QZNWW2146539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e9b51c4e084ae84ef69a57cd3513edcf606e7b0150987ba98c8ca3fd00cc4d. 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/QZNWX2193500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a4693627381ddf4913fdbe8697a800c320a4c2f7d993e08c2bb351404bcd1f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZPLR2184915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6e2563cd92a2f1b77a47d39262878a85b74a99fe90e37e667c749ae1c72d8e. 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/QZDA42260814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd020f32fd1bbf58352c06a23c0e5813e7961ee38ae564eb79611c7bc1ead2b4a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZDA62236199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043125ca753b37f873bfd5f7e77810a2c3f7ddfb4761b9aa4128b704993d7b6f. 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/QZHN32218665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d110a429fa130a99b0d127f637bf8725f54e0553a46af33e21e6ecdd1206f4. 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/TCAGF2282692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035a5bfb7aceecd82d84ed11d6b8240b26785cf6d742929a455c9ee1c13a3006. 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/TCAGQ2265382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68920c5ba37a4507bde0cae5253e8dfa8178cd8e251607ee7a4fe07ec16b07c. 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/TCAGR2263196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70875f92f0c536cb06be956ed8232a34230e4106d8323a0c9b33035ba09737fe. 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/USLZJ2335014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be3cb6d8ef641b0889abb5bcacd06f87de92b12da884e0f84d58f33a931efb2. 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/USLZJ2354701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8388a5ccc8eb0e96e1de2781be780ff77e7b4b85e4fa46ba67fe5d4e5a729aa. 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/USLZJ2334873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda82bc0fda8bc0003b2c2579018e7dec565c8a6d44960867201b063e6f30e31. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBWUL2300765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c3a2cabb449b608afc612db5d05354fba9e37f1d1849a5047d6a29dd6a8e37. 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/GBWUL2330001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2370f9f721a5266c080d9f1206d723ebe966adce611b0dd96859d4cdba59f4. 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/QZMEN2396726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7005fb5f5b3df96c33dc8b9a8c773149514e3b87bf88832f5124b434b38e2b2. 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/QZNWZ2300705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b8dbe3c1811265fd3d814eb914085cc0edbf4ad9de77b48c80d56dd4e17d39. 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/QZNWZ2300706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf057139d3e54636449c98c7f18eb82b5ae252ec8dba57300027ea8d608058dd. 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/QZNWZ2300708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08770e7be71090aacee06037175a9c61be24d3592fe3b47ba08b1ca3c393ff71. 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/QZNWZ2300709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2945ad9c7989a0e848dd93651486eb21d9e60bf03e1ca6fa4d00501b79518a34. 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/QZNWZ2300710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc73abdf46d31a3f4392ac793cfa2dcf77eb78062fbc70dd7e872e36141a43e. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZZEB2323356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efabb2dbe14def81335828eb8db4c63ae218a7342cce89d4faa009617bc0488. 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/TCAJB2427552.