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 0xf9d880d294f3f68a105afe1c6142a9e3105096bd41b40341e8b4068bfe36ecde. 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/dc572eab-8ed0-4cd8-ad4a-9146a7afd30f.json and https://artists.proofprofile.net/proofs/artist/dc572eab-8ed0-4cd8-ad4a-9146a7afd30f.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 0xad5ad709cd9083347317d0877e14fba2e983a206148a2dd915731be94e3c1f91. 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/QZNJW2279484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6935c90479055d895fddff5ca9842ddcdd9d166fa38db2b17ffb12aded3d0ae7. 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/USQX91800331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b28bf6b72410e7e437dbf764b28d9f8ba32533a9176cfcf4b1dbf5a6f7f98dc. 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/SE6XX2180979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c3599bf12a4c5a5c00b1b748efbc112348be5dbf98246117cec1a05501be24. 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/NLX1N2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a3f1418c4bbb8eeba1a0b1c4a5a9736d99af3ae555cb129f3d58ec38c6f486. 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/NL5HJ2300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8348dfb85391f9b10ea2261b9c8c9eca36cda665604074262a11adda2e2c483. 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/TCAHF2341636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9533cac1887679d1b6bb827e5045c0c3e81e2fbc7a54320b284e60546aef15b. 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/DEQ022390973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346951cf48c7102a275e9d8121145b54bfbe0cd1ca48afa22c15b22dbf7dd092. 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/ITC6Q2200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c83f43ef2007cb6e180e88368b51eb3aa4b3220ee26ac01a12076ea44a495b. 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/TCAGZ2385494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d90a799786dd9e049260e7351a85c8595b70268753d58a847adf1cb79ed5a2f. 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/NLUM72100639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20aa098df5ef0d701075ebf69ff565e5a9bf1c7b7f89d2b40cac869edd1c8cf3. 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/DEKF22101224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea4912f28beac00d7588b64c11114d31f7463c84d6561e9da035022618e8565. 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/DEKF22201029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cca572dee5f687ee874bbff9dc5eecd770556ea9ff036747a05334f6b16d1a5. 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/NLS242300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cca572dee5f687ee874bbff9dc5eecd770556ea9ff036747a05334f6b16d1a5. 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/NLS242300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d704cd18788f8d574c02f2729e0b36cc96fa02062dbce3b4bdc7035eac467f. 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/TCAHK2335666.