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 0xf86d369a08692d53b9276e1cff5be41a40329eb36b570e550b2ddd2b33697add. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bae4180a-53b4-4a29-ab5e-2c1997a4080d.json and https://artists.proofprofile.net/proofs/artist/bae4180a-53b4-4a29-ab5e-2c1997a4080d.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 0xc90ad423024872a821e4708311e855ab63c993948fa9389f17c9933fa96a5daa. 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/TCADU1854786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c2ac452ca8dec5e1e66aa74cc7671d098c62aee348fe7276b5864ac0e32f74. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/TCADU1854860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8973bc971849417a1c678514c1f6b1ff41f14310e2e6185bd2f6f45c965d843a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCADU1854862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0faac4b6fabefe7e214d7b1aabd6b6cfdcba7a6faa3406e4b4d38b11248dd02. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:03:02Z), 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/TCADU1854863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49acc942bc885e3dcc4ae869743166b66cf370ef5b77096419f27fb2741e6675. 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/TCADU1854865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8590a761f1f6ed156600a8691b16e96a4065e515948133d0ad4d3b27329b7e5c. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/TCADU1854867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020c066164a6cb6d8ce8c03d420e2f9400f668a59da620ab08e7147ab8df14d9. 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/TCADU1854868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4413c8a7c44f391d910e540daa1743cd370d6e4ad6a68f1983c1bd6621a1d2. 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/TCADU1854869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cf15707ba036c8efbbba7f6c47b73320bc9427fc3a1e8ad8c05d4b25ca0ed6. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCADU1854870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe548c7d844b635caa00db69d22b1f39d89dd35a989243b62fe481e2fed3ba0. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCADU1854871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383cbacb1c3fb1bae5e04d8fab631378722172fd3cf20af1ebfac5c982603cc8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T16:05:51Z), 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/TCADU1854872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7c9a151bfb16f06e9af12b3e3d4eeec4fc216e3d2a39e5a8921d8c1a5e6bab. 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/TCADU1854873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8c6a711083658d822538a9290ec0dd79426f98f3ee431d6ec111d81ace622c. 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/TCADU1854835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a0d5cca04beb55295428f96089790dfd998e72a14d174318385ebe44b5696c. 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/TCADU1854836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5961bb5ed0f8552f994bb1b823a127564990c608c4fc53c585e14227b3154bf8. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:04:47Z), 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/TCADZ1842115.