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 0xd065e332ee1aed26c6d1ec0ac8dd6dd0491879631ac862c7f7e1a9861449525a. 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/b5bb2d34-2978-4d40-bd48-a99cb0c73901.json and https://artists.proofprofile.net/proofs/artist/b5bb2d34-2978-4d40-bd48-a99cb0c73901.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 0x81704942d49aad5c72f76005b7be152b6b7966f1a3fcd3e3616feb1589a5b324. 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/INN892400324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c713a28dcb8d9bf4d682759c0e8b79d3953b4835f2e0ac2d369828bd98660d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS4J2400613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbcf1d089f67cb98b042589307da2dea11d80e56fd50b94c9bdda1a3269f5a9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INS4J2400466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacf66cf0703838e74d383a18fabaf1e58ebc115acbe38bdac4e956ccc7e1b04. 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/INS4J2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189095c4140b13745d7556cc605ddaafb808121685927ec06342fda36f40e982. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/INS9I2302797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3519c60ed0f3ea67087333c13ac230a255f9b85d68d4dd5a3eb1552a0652cd3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS4J2300965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e64fd5dccc8f25895b951b572024c27ca2da65bf8ec48210a22f4f043fdff9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/INS4J2300214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7f2453e4867cfcff72656962f31380746fa11d9aa223d0fe3ec4f2710e55b3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW2331512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3101e703942a17b787698ad68cf9f9ca282357617ca7c1ead9fb95a879f80b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INS4J2201023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698f1e7e9fc7141d64f02260eaa67ffe798eecbc1d4f95117300e7e52b79fcf6. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QMDA62253477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd86df30c9898da0afe8327a163c0cc5ad63fa44250b097ed757fd88393f1b8. 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/INS4J2200900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2e4f88c5ad5ad2f007823be4675a1b7e6a26377013d790714799a2104c9985. 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/INS4J2200675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebfb29f76c0f2b16c34d1d4ab57f70504cae94f133160782b55b572e29f7eb0. 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/INS4J2200572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18d6ca148a92aabd35f6ecd2ef8b6c4b398c13ad7f112527a189ed5d40e627e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM6N22286045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8500d2eccd681719a6844f3541c5bfb3e21a3bbd8fe3565a2e3cd572a9c92ef. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/INS4J2200319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f83826b109b95e144f16654c5c6431fce8a310fdf55d522f82291bb818ac103. 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/INS4J2100300.