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 0xdc93a1a5680fc7934f565c4e6d5821a35c29832f774d71c31a103d43b5486fa5. 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/f2180ce1-16f9-417e-b6d9-fc26e0af482b.json and https://artists.proofprofile.net/proofs/artist/f2180ce1-16f9-417e-b6d9-fc26e0af482b.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 0xfe9347f9460cd504ce014fd22b0364970f5d34c397964e74e0fae29da119677c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCACJ1588542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b270bb7389393779e453f0faf4b5e7cdab930d80ca9a85234d6a240626a5b6. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLK2Y1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec0dcf74f4fdd7c82b7dec40fde951f59f408397e40d7646198a2990d09a791. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCADF1760642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6f0b2533e1c4ae25fa0795aa7196c5cdb05d361f10222c6f1bd4e106abc6c5. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USCRB1900161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b51604b6a342958b4b8141c6777810ecc69ff62e04aa77ce3cfe9764990abc3. 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/USCRB2000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bab4402c8d32a026e314f05aaebcf0228ab56ae8e55f827c13b830dcf896ae. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/USCRB2000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ab6644cd8e1afd731f3fcab12d0accc8243dbe149b9dd348121224e537c506. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USCRB2000066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0309631c641cf34677c1be35d45c23daf5c96bcb55f790010cbee31085830b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USCRB2000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f107c085113f9d80e81fee50c03fe0e3e244e6c43ee57499bbc4af04c32cbc6. 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/USCRB2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b34332a5e9e5c132a4be6081fcae95676d0649b0b64ca6db1333055177360de. 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/USCRB2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02345993b527eb4adcf10d16e2ad36019169d93c1628027870da7790c74d4d2. 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/USCRB2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f11ccc614fe8718fe61471dd08e4b598761acb1a9d9f1d7f8e87228a88bddf3. 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/USCRB2300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea473465bc3c550f939ed14d7d70b72e9eb132f11a33ef748876c170e7d41dc. 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/USCRB2000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fdb3954adc97a2ba12aa1e9e1924b8435f81bb23b82add8df0c79922cbf0c4. 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/USM1C2400343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78f350c9c2b7e2c5f795a8d7f420dc3b9f58d45ffd0c7101cca5fa8f4918404. 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/QM6MZ1810155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20985c4a24dd5eb581a6530a0f3036b44b81f58f02b9b8744906f6bab50df25f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USM1C2200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb4ece0c00a81480720ca835db010bab4087c5eea6d5664ec4127264246719f. 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/USM1C2100129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11170031ed64d8f177a66bf858cd7a075949f7fafca0c0ae71e060a807b36c9a. 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/USM1C1900139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750b1c787376e9a05f0589060a0d58b013fc63dbc6a6fd4f62130a08c9c44fa6. 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/USM1C2100182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab02c961963984513f0a20e46c69fb695e619fa24e3dcfbff28b76b389b89ab. 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/USM1C2100187.