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 0xe6551012d03211d1b095c1af557b5832104c4540a676a567ea1af6f11856e862. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/359e3594-1133-469a-a58f-28e46c0ab9be.json and https://artists.proofprofile.net/proofs/artist/359e3594-1133-469a-a58f-28e46c0ab9be.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 0x2f83d43b6bf747474404da4089d1ac59733aeca95b7913a2a5ebf34ac7c7bcc0. 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/QZN882253844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b5d128207a6086894c77d5ff496a5fc65149f35e04cedad2c89c07371827f9. 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/QZN882207213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb11619f09231578c270ca20eb800506a4730b88571f85607833015fadcd71b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZYFZ2314633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b77d271e56cb5f59afa0f8440af24e6d389170d0f073ee97db80c466147a4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZZ662339741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700e3ff0680c09511d7534907daa238aed83a62ced8b6a603525bc834891e860. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZZ662435719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc85c184aaf6891902975711b73677cd54db9f4eacebffe01e431b3ced155cd9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZZ662315517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf53f940a88a3a519a14a8dd324c9ba132c95849a4032a3ae3a42ef51bb8b4f4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWDW2308881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373c66e209a98fd5ab7ab9bac1ed5126b11e507e528949fd532af133435c9d4. 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/QZZ662372084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167be5ed5ee7960e932a63fbfc667c7b5b66dcdc712fd72c101f357d1755763f. 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/QZWDW2332572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f0c855bea7d0a5dbcc0b34186ef0294f61eefe074394770b78cb6b8eaf6ddc. 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/QZZ662318926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dab0706f7bc4b32991f0bdea4cfdc9f1f295be59a4dbed64642be383f0e9ed. 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/QZZ662455774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700e3ff0680c09511d7534907daa238aed83a62ced8b6a603525bc834891e860. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZZ662435719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373c66e209a98fd5ab7ab9bac1ed5126b11e507e528949fd532af133435c9d4. 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/QZZ662372084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b77d271e56cb5f59afa0f8440af24e6d389170d0f073ee97db80c466147a4. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZZ662339741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1c8f46265c1f089d0310bde7d28999aa6f7380f994097302a4abc0225c3a37. 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/QZYFZ2384005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515d5a630a0fae79e26004a9aa2e0bec13a3bd8f57b9d7266bb76064d19bacd4. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZYFZ2368366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930229dd8a26a8fe643d3c972369fc1859a9560805dbf200bc87bccbb0a5686e. 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/QZWDW2379789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7fb82955c6bb3ed1f4d91f8a5d282d6dbf23f4fdcab8dffaacb617f43127b7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZN882386512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76172c3551e7e1ed88305d34991eef04dc2c7d4615651a8460bfd47a3c69d4a8. 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/QZN882340540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721a9b93d65fd8314b9ece8ad0d2cfcc564338e80fb4060d0e2c15a8de5b41b0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZWDW2200986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d71586798ef822446600cd94db13ac54d2b03c305bdb468976861438b83eb5. 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/QZN882271756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed62e1f1cf0769ead76c9b8386cb1888f1c08b6bd5847f8232218e7f7e14b65d. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QZN882217599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c32c7a1e9971901d5cb755b15789b15cc8f81205246756178d8d7ff14f6fb5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZN882529870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876f45766b481ea5380cd4635c6421ae9966707e0a4c026b2aab689fa208ac7a. 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/QZN882439053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2df5cd90bd72479fb8cb2649b2814fcf7745d717202dbdb4130fc4caa3f9458. 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/QZWDW2430855.