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 0x7c01cc5ccf6bd94d5e287be8920787253a544bf6f6b6fd38b8fd6890aff347ba. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23377688-94d1-4435-b0b2-849b54bc19c7.json and https://artists.proofprofile.net/proofs/artist/23377688-94d1-4435-b0b2-849b54bc19c7.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 0x8185789e7a529c00d27d802a481212e6d72bae879e7927099c1c5ff9d58d88e1. 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/QZHN72565043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70edb84b6b0ee7cc45a3163309ab8533e724a30e89eea23e3c250d6d4322384f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHNA2594318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a8981a68996ee098ad129467e0d82684a1c228e87495c14c7181a870285553. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHNA2594319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73783b89e299ddd510f83868aa255b659d2f0f71b288450c7415eebb1893943. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHN92504588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cf0d50b4aa205c8a24fb574961605e1f25e3938d1118ba8ee19df39ccbf11e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHN92504589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3acc180cdfd826ee5a96f46e543fe949845b286ce497dc252795a1e1010d7b9. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZK6K2578751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d6531031eeb12537a21a7653c0aa2f65fb453000bdeaa83f66020880f09594. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZMEN2596311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c46cd5724157c7375b9f08a2bc827af5dab637d8fdd2ac81f9e896a073d986a. 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/QZMEN2596312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1d7eb900f06f26188698b7cf17bf3935f1de6619a72cd8744a3eec4fc27308. 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/QZNWU2585298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1140ef842b6d0e750d8224fc100c100ce86f8059feef4603e754fbb153ba786f. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZNWU2585299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b85c5588f00a8f8e22516e03d6db096e5cabb217a494568ddafad10caf712e5. 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/QZNWS2516389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213de0497c451931988987cd3bd8311f2e4434dfc69bbc7b652d8d0c6252a37b. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWS2516390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64c929873816c8cc4ab876585f03804dadc30580f0be4e0ff7d7b89e6d0e538. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZRP52556498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58337aea18b4d36530ff3a60d4593b061247d71d5c49bf8b4803b34666c79365. 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/QZRP52556499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e9b10a42e262ae16f193bb4597b5489f88e4c43796b06edee9e8cb349fc97b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTAZ2502206.