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 0xb9b1d2e310d0a1f51bc24019250ec3741f3eddd28fadfea6dfd53c940b3137a0. 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/7b88dd08-6fd7-4b28-a9ce-8dc6c3af567e.json and https://artists.proofprofile.net/proofs/artist/7b88dd08-6fd7-4b28-a9ce-8dc6c3af567e.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 0xa3f41ebe7904872ec1d42e52c8c573ecf5f3de70b06f29adbe448159d97454c3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMEN2314588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48eee6189f88caecac63540b4d5acde44c3fd8710232bd565916103ad86f6b09. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZMEN2314589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486e34cfbeab7721025a900659a7bceea13877d0bb82c838e82103bc2c1aef52. 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/QZMEN2314595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacdf76bf8e29f7bb7cc6b60968582f0936178fb8cf3d4c30bfe0d7877cb917c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTAU2369357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1615d0df17cbc691958df2900533d6f6b4b777d706384eac1e9f41649051aad6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFQ2380861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62b175ede0ba74056dcfbbe495bbc23baf5043b4643f3e7cef034c235e87e3f. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZDA42427938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9417f8ba00a2114e9652d9e5d4a1ecced9a5732df21226eb91d96f8b85802c3d. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZDA42427945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e233877d37b06a6d08b59bb6760b74ee9c7088014234f4a941d05efecf7ec93. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN92494542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007558491414a5a7f9f35f1505c069cc602a531c49359de53e9a0dfde79a4dce. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZTB62471635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa0832d575169cffd34b360140e7ced8f7c13321aaf62c0ce2bae6a93c35315. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USLD91774343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34faa1f337e0751e901b80b927243af40edd6be7e38edab04969717b333b32b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USLD91774947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5959f996396bfd25e809a8ab13d727e2350fd3e237776fa7dc1e93d99da16dc1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USLD91773477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79606c6f9a2b85cc5919c20726efe88288ead2a8fe3c93806e9ced591089037f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USLD91774954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc663e3bfdd7d3a4fda8941fcb2d709621ecd1cae286cce89acb2b4cf41c7457c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USLD91774959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e1e6d36f83155326b45796c2d4d40a95efa2337e933595bcda8cb974445dc9. 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/USLD91774960.