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 0x3bec22177564d3136a4006c0b77626b38193edba5ff516ac80154f80c5355eb7. 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/220dbff4-7e60-4641-8706-1efebbfe6018.json and https://artists.proofprofile.net/proofs/artist/220dbff4-7e60-4641-8706-1efebbfe6018.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 0x2a4aab88c16b5f179ef0906bed8e109117e37fd64ec080543507058e0b5811ea. 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/DGA092325313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4808a69fb2d4184f578714099c4cd9e71b209b6aa697d19c0d38fac2ba13c9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX3HH2332622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecc9d7ebd1a2d318995f528579a64138da2421a677c4239e99d426e8c17a65e. 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/NLX3Y2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe248dcf02c2588e16db60a99ed48bc18a00237af7045649b397166a6302765fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR9W12318207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1fe46d776774057ebde2f3d8a578c152299ae0893312daf64a428cf680d75c. 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/FR2X42348001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b40c7b3726fd1151b5a330b310492c7f7ce5f6a86250759b4dd68075d28329. 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/FR59R2346076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3793fea5de4aefa406baa5d7c62a7ed38234f70589ff3e3835ec43312ad31a. 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/DGA092225438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62353fed2b4cb727739031f224a50bd6a13b84d2bba08025e2ed76e9c7856838. 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/DGA062270191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291cec5de1cf1d13eef884faa4b4058e6eeb7d1882bc4b3fa4c6f52682a9b155. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA062247971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce37fc8fd83d7c38b5c51980b88e74f34bf06ecf8d9d5057dc79ac6ef1a9b21b. 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/DGA052209946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe586c1d18c5b349a4d2b048fb7de0046bfc8e2729d310ae37607bc3f8b209709. 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/FRX452205014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585678e12d5fb2300451d56893d8984bf580bc324cc0708a407bed67fbc5f45a. 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/FRX282273627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240b8111feb51fa350b3a85e119563f8826b68010abc10df9bafe9ae11ed4708. 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/QZFZ32220796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a5a69ecc1119dedf697d1db0701c6391cba6ac6589725627ceaef3767caf2b. 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/FRX282193598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcdf062df13bbfb88b40eb102183717c5927822ff8444cbd9bd15122a525218. 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/NLT2H2100373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f571a0e445bd21a77e9c83c0e8eed3afea5382616072f6a9a2981163e8c5f46. 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/FR59R2109053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edcb26fa67aa4395cccd9a7d210774fc6a7a4728c21fa0a236c7077070399e9. 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/DGA092368035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc0acca5beed96eea89c73a6e64b73bd7b967124d8e8f2c6aa2d7190357841c. 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/FXQ892300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c96f2b118fd68024f8724684a388c72f14d00b2f6e7e1d3dea87d0b936677e. 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/FXQ892200282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4aab88c16b5f179ef0906bed8e109117e37fd64ec080543507058e0b5811ea. 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/DGA092325313.