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 0xc247b0561ea47684e7c933611466f69dcfb3c7d76d071196617eb49586bcdeac. 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/ad0bda8a-e8f9-4b27-8f5f-a3f80940e5b1.json and https://artists.proofprofile.net/proofs/artist/ad0bda8a-e8f9-4b27-8f5f-a3f80940e5b1.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 0xb743ea227d8c95f90ca2d22ca2e6c14bec3f63dbdec81c4ae161d2b8d586bd3b. 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/QZTGW2400264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ba2fca810f09750e95962e0f67d5f05c8b4b5630851a305de76e28a43f45d5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA5KR2439479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9086a407bd2512713c0f08dd112d31e976bf1bcf629bcf154644f36079635f7c. 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/CA5KR2460687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202567177430c33c8c9d499a9202e57be884c3eda332417ab7b765a297c879e5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CA5KR2460684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02db20560bafea8f2de1ff3b5933de05b1fd11cad76da8c3afa51a17f66e5266. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CA5KR2448865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3938782bca2ead78c9b460dd860583dd0ece64a1bc4aadc70f43b129002651bb. 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/CA5KR2448857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591181207db106461c7eec6b8776b24624d573a4eab9802fb1fb39ed99f4918f. 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/CA5KR2448858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47123ebf253dbfcfc03c48a5ab07ee68e697baff6c613f9f50a1726897345286. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA5KR2448859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a035948a5004cc7fa468dade7ce777dbc4fa9ccbc5f7cfef0f44cc9fd0cdbc8. 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/CA5KR2448870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bbe8be71395130edcc077593c053f833b10b29090004843761f9074dc73bc5. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CA5KR2448862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd6a173411bbeef7af1a15d40ab142beea2ffdec454c702021c43470a824af8. 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/CA5KR2448855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69177c824326d08eec01209bb640f4c26d36ef1fe84517cd2c69a583341737c9. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CA5KR2448872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb5ec34f56feee0e355fd0c71dcb9dd12eb1cfccbcc0125592efdf9a2a0a7a3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTGW2400265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ba2fca810f09750e95962e0f67d5f05c8b4b5630851a305de76e28a43f45d5. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/CA5KR2439479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02db20560bafea8f2de1ff3b5933de05b1fd11cad76da8c3afa51a17f66e5266. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/CA5KR2448865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47123ebf253dbfcfc03c48a5ab07ee68e697baff6c613f9f50a1726897345286. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CA5KR2448859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69177c824326d08eec01209bb640f4c26d36ef1fe84517cd2c69a583341737c9. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CA5KR2448872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202567177430c33c8c9d499a9202e57be884c3eda332417ab7b765a297c879e5. 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/CA5KR2460684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bbe8be71395130edcc077593c053f833b10b29090004843761f9074dc73bc5. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/CA5KR2448862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9086a407bd2512713c0f08dd112d31e976bf1bcf629bcf154644f36079635f7c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2460687.