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 0x5a65871b7dd9031208a81f9c6ee20e45b3bf6e68182f47ad7e18c8f52d6a5cec. 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/e437ca4e-f6d5-4dd6-9e8b-b0bc2dd18779.json and https://artists.proofprofile.net/proofs/artist/e437ca4e-f6d5-4dd6-9e8b-b0bc2dd18779.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 0x55e975471edbe093ea5b4590c1820274d2d97068a496bd657bc4abf6db0817c5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWR2458049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e074044e6840297a0279ae9eb94a25737cc4d3c01b81f6cc48d007e57b16c1a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6F2221915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41f2d42659284e097a2066b15b3f78cff3a56397f8d782c68117ce026bf4a59. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6F2204684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88f2f7712a2552bc132cbb013f6a79e02f185a3bdf88f0e01f0f346bfede69c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMEM2249228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95db8c5b679599ca3abf39638afe194061ac015aca05255eb38b35ec5f7f36e9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6L2289828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dddfa30ce93d1f0ea5943c5c020e8012b7a7a225be7c8a3faa70bf36cc92319. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA42249715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd311d69ffb6c3a207d99f88ab2d7983434270aefc29f5dffc46e92fd5fdb82f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYY2002901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f81a0ef9accaf9a78be9bc482fe8b5d39f4fc3139c4274687cfd5927a3821d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHNB1952008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07be0762a8a799579e596093241f2171f8c77a047650157caf00f6b34054d3ff. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN61999073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9c99128fc81a122c285ed6aec1febcaf778395f5717002e4805364443dba7b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ41985490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f4924693950f67df75c602fedc976707fae75fed8bc5c5e2bcfd5e73819989. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFYY1955764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2580811dbbe5e243c69152c7a34a3511b2fba1553edd03b9fb3e9970723423. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZES91965989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f850abaa927fcb1f887dced77dd7abffd3443a1087d35767d0f3c01554e3c5. 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/QZES81945891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bd091266c869b3c5362f8f011b29b8c8ea31d9a02077d241f52c4ed5d119ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFP2407979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ea86cc49499f3e78e2b22fe79acf9c70a91aa2c04f4c0a25912896d7525dce. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN82188324.