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 0xd7d3c62270211b4348fa17eb06204e2cde9f36b8e09c1b6599658a9a7f742797. 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/7e2127b0-36ed-4692-966f-28bae25d8f85.json and https://artists.proofprofile.net/proofs/artist/7e2127b0-36ed-4692-966f-28bae25d8f85.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 0xc2fdd0fbf433435356ae98c42b3cdb06060f8875ce112552e474a33694350eed. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FRX872190164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f68f549a034e8abef31cd5107e75dfff5948c2b5d749d4cec5873c1da7e5c3. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FR10S2255131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a8cf57ef6b831e23e531c9bf3d1eacb058aad702d5b04e1f662fde930c4ab4. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/FR10S2278222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26232963c50b2107a6e125d2805cc8a98256f5d6127e5318fbd73303738899d3. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/FRX202272171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5256898fd5bd53239a36c411d38f6f1d1fc8b5ba16e2ed06c0340eb05ee9c5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRX452218609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c9b62963eee7705557ef0dfcb37a3e5fbfb5ff5661db7ed832552ec425434a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRX452287993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3688480a1d0debe2d79433a9bd890667c5e63bfb37bac9f5beee729e7bb8baa. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/FRX452287995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3896c42e1ec73499e990d6f49fb1a401fd4c2546eca129d5497d90fd7de9edd. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR96X2352109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8563050adfb3d8f824cb69350b59ec0470f8124597bdf23f026ad700207f3850. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PL71Z2318393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965127606cabf0b3b93b1e5412450d3d6cd73d8cc504c5523787f3d95d8c4d1c. 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/PL6A22331275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8279b65916173eac02d1fddfa2df10b70a98abb0c4471a64fd5d2730ed3785. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/PL0B62370050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac90bca3195172f53c343c11fbe5d34b03d8506b834d93c4a49ea9bae1a67a3. 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/PL44J2485498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f184a77e762fd7cafb25ddd8e8413d847a892e9d240f3da46db684710c19c7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX282487617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8151310aab15fd8baae6ad3d5e301b05ecf7b682e8b76f2a46a5343cb6b27ca. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FRX762407902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddd957f35eb7eed4428388b4fa55a1c58d5c6b0186120977476b703e5a9b67d. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/PL6A22478471.