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 0xf45337768bb5cbca63f4f4ee4bc61a312eeafe17282cdc7c9085b12c9b638f9c. 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/e6e55a41-ac11-4dd1-a3af-62971e96ad55.json and https://artists.proofprofile.net/proofs/artist/e6e55a41-ac11-4dd1-a3af-62971e96ad55.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 0x27cea877ace9cca39373324d07c9c4b542c6b5ef81749534ddbd235cc42f8313. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/PKA061762995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9add96c476d95f0c4c5327ffc462996ec18691af71fd5df89b744cf511134790. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UKJ8H1994697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2738dd004394e4b487a7aa4c4fd26693180f37a9aa0e5b888376439d924dcb30. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/UKJ8H1996744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6e049a52712bfe78d5de110a9d8275075fe3c7e469fbea3337e93d01785995. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKJ8H2000991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42df681abc50a8a2d1c71f7b60826ab9f17f2b19210f571a3ebab7beeb6824cc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKJ8H2008452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42df681abc50a8a2d1c71f7b60826ab9f17f2b19210f571a3ebab7beeb6824cc. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/UKJ8H2008452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a746c45decc4409d19454887881e7df326ece69adca5b3c8c89cdb355b24804. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR96X2198253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485354fd34dba4837b1a90211865f37c6c1ffd8ddca4411f5bd04a6280e20d9b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMFME2145833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23aa4daa660af8cf7d6b849adcd55406b79f6f6b7d260b3ad974c19af9896f82. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/FRX762177722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e1f800efbe98282b12464ce4321bded954a5490082e1680bef90920d7c8ca2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN62450630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d390bf171505ed9e17549331fb0059c5f50542d4e765a3e21e7317b2bef3dd3. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZN882509849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe346dfc8ad0e7045180ea3304c6ffd4d523970341680ea0db1ad99d7acdba73c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FRX452566497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf221af357803a3aa4dea353dc83ace900d6a56fe7c58dec38032e6c4b0f89f57. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRX762546798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b846743cf5d4571687f7dd80520690ef93aac6d87610662ec878d6be32418e. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/DGA052565986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdce742c97747e06d37a8d64a89054ed55c58178c566de1093bf7be01d365b4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:10:02Z), 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/DGA062574965.