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 0xf4113eb475b3496d73d358adb7881a6ae596d7280f08927596e95e3fd1505720. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ce86199-83c2-4dc3-a29f-bcadd509c12d.json and https://artists.proofprofile.net/proofs/artist/1ce86199-83c2-4dc3-a29f-bcadd509c12d.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 0x6323ef8f10463996a92492b6a470369ee5499c685749d5474af01009d836ab50. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZRP52509794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1997805d8a3dfa839246d999907959969daf1e0c9a3f56cddd1b855c6bbdbc6. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZRP42567799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb5a28000e495b01ff71361f5a748bf80785cdfa3323f4304724d92f60f74ce. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAS2540087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0d7d1d2f50d33c03a6cc27d47b0e70858422ab59dba2ad5e9fd70c8432b37c. 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/QZTBD2573361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558cf694b499676cf007c6c191d7349562b633707c04105b92e45568625be825. 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/QZTBD2573362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa4e33963d66500058b84e1da861c73399c96d15a4c01e74e1798fde5149cda. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTBE2505435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41338c0d6f36f955756f75aa7014fcbd06c687ed4485df8896b54e4cea8ac8ff. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFH2557693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb04ba472c458f57f2929300618f559c6d09716cc50720514cb7d73919c64e5. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFH2557694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27927249040ff4caf99ea6667d1b0b3dd7c0ef333118945a1214b8861a626a60. 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/QZWFH2557695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6083a95ae7a43f2ca414ffffed643dabaaf6fba0a9dd479bb05071f054d5729. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFK2560217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf481b8be8a8580e3eb53f1ed80cac863d590467ea7097daf7f41e42f585e29f7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFK2517614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26811605c3a322c66e6d2389b65ec72e6bd0f86576de1e33a3f4334fedeeb2b3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFK2517615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5865ea3ef84b013059fa74d9162ad783421b3f674acae5a959b03f1a6ea2df33. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFM2573472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7a7dd82545b51396445437a9c2147e76c0a35b88194b564b2e307c7b21a22a. 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/QZWFM2573473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6770bf88ec5ad250f9101dca570cfdf00756647c29357c6b40d3e0ee118c2edf. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZWFR2576252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac49ddf1bc238166869fbf18910a630621386b8c7c4f6fc3f2e869cde9a2f795. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFR2576253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc1dafe413faac98cd274aba8093aff0150de7fc46b3fe6d38805559419455b. 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/KSA002611732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f763dbb9e10ddbfd5d42df2e0bf21547c3ad049fe6a1deed406047f35a0c0f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/KSA002613946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd045760c81feeb4ef7ae5120f44c3b59b1ac2f7913e62dfc31d3d49f1f31fa. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/KSA002613947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63a11bde4eff84770be1ecac65ad046b9fcf7a65311ada4cdbf704a95da417e. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/KSA002613948.