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 0xc2d522add91d72917371fcab00e3bc7c8013cf38ff242b0d4eaf6679aed0409f. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58d3a3a6-9f5e-4b6a-a9b4-5e04a3e1553e.json and https://artists.proofprofile.net/proofs/artist/58d3a3a6-9f5e-4b6a-a9b4-5e04a3e1553e.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 0x3b1a721445230d410bd496c3fb4459800f5742df4781ad7fdc00b8c693521fec. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZES52070970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa870265f581cebe30b2ea7098666dcd430ecb58a2d7576673ae23b2807c39782. 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/QZES52070972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e503f1aa0f78647b54d715cb26742bca245d341a46124921a5411d406be5fa4. 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/QZHN32125440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a98857af38b13397f41a9f895ffc15d64253a695e21c38ebc1aadadf026f4dd. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6Q2424932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1538d0bdaff94d2ca1e2b2243f0fa02e373a8073ac826e947a1eed2b748ed4. 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/QZZ7U2461687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa621d5b18d44a25639a85d4d4bf55088e0576f8e12d82e742d258b7a2af7b47c. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZMEP2580047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f7ade8a60b31e3760e4a65e5a09316dd50c425bcc5579ec8e3a2b8422f5046. 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/QZMEQ2555374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa621d5b18d44a25639a85d4d4bf55088e0576f8e12d82e742d258b7a2af7b47c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZMEP2580047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab79adb13cf1e4c58733824d3a6586799a2a335a90fb21165c6e833568cd02b. 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/QZMEQ2555375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25df7a14c51c24ff048ba19ce9162baff7b8ec837961926b5771f12e9560e54a. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZMEQ2555376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715beda52d382df209c9bd253c8549994e15c020f3bfcbfb4ea7506ffba13732. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZMEQ2555377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a98857af38b13397f41a9f895ffc15d64253a695e21c38ebc1aadadf026f4dd. 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/QZK6Q2424932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4972f8285bba0aef247436711c3fe52e6d628ca61108d1b071ce956193e5d50. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZMEQ2555378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04306dec4de82f64272ccd0f0ef14775ed6d720ac380328d8a536340e7df50a0. 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/QZMEQ2555379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e38ac16eb195dc7923f199e509a6fa67dc67821aeac2f9372dc329981eec83b. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZMEQ2555381.