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 0x093f278efe8f3d50310d370fb622ace08ee7faa277def2087497d5ce3a90c3f5. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ffd65e2-e869-45a4-b7ad-89dabc3fb043.json and https://artists.proofprofile.net/proofs/artist/2ffd65e2-e869-45a4-b7ad-89dabc3fb043.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 0x7c301926b0b9fd8f5d19e8a67b45cd745a5dc5c4ac98c6b1459a9ac0a00aa55e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZYHJ2435057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0844a73a5b0938e72fef4aba1f56d854a3817d2b421436990d4fb9235335717. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZYHJ2435059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf800a5b9bee9a974c5015de22fac93cfdd683a03a0ad3dd5dfecf863664870cd. 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/QZYHJ2435062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0e83eac01196ee0bdfe8b2ff488a52c7401a64c8aa2e51222ef3d2929157ee. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZYHJ2435063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c1c48bc693d22204a19523b4b19300245d8318403eb86823f3e039b6c45155. 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/QZYHJ2435064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fa3b115c1f293fade07288b79d2c4f7760f52d9959e878c059c9e2b090204d. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZYHJ2435067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ebb5c103335eae85421a134cc57cd5f36acb246060d52b495c6d5018665997. 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/QZYHJ2435068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68ceaeab930790b23dc4797ec7c315f22bc056800153fcc4e9943c4ba0be051. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZYHJ2435069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6f2e394363e6df1b27c071086e45c6ab925ba6892775ae4fc7bf75db90f3a9. 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/QZYHJ2435070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29ceb09550a7d0ae1676d75311889686f3cfe754d84dbe107d538dceb2a7c06. 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/QZYHJ2435199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7d970e8eed7ffaa83760a7938c6286692e64fb053d63d126810e2077dc29a0. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZYHJ2435201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f42dd4895452c7dea1ef9735c856eca1f93709d5ff760c25f505e659649163. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZYHJ2435202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d8cb078808ae332c1b4d7dcf4f9b0890841ee1861b1e1dee0e10bb6658f322. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZYHJ2435206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbfb4afd5cf3aa6ef3f2a9dacab30f1448ec533e85fb370459f71d438370c66. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZYHJ2435209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd4c997fdd769cc7b5ef452d3dc3007b52a31bc467cd0d86183ff99bbca694b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZYHJ2435210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a6f6a2be8bf7e5eb61ee5990641ea7aa85e1226060e154dbdfe0c22aa38e2f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6XX2520493.