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 0x295f0c138345e2663761e7461cac7fe93e1ee22c9566745804d92f237c1a30f3. 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/c8cf3940-86d0-42a6-9dc0-e06ee013b594.json and https://artists.proofprofile.net/proofs/artist/c8cf3940-86d0-42a6-9dc0-e06ee013b594.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 0xe744d771dbfaec131e8d5320a70ae67b7f0241ecd27a5886fdeea30cdeba54a8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USANG2223246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8c761c5fa1e8ddb58a24c36e5fae13cb3a71329f0bf8672fd77030898e79da. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR9Z62101142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c6e1b586a2fbca5a6f5e04849b9a4f58ac395aa717609d5f6ef8e8a84a4c06. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/FR9Z62101143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa622f48348df778a2b8d7d08e4227b3580683ab68598dcd5c1952f1b004aa475. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR9Z62101144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895325d8f6fe01e54b8d81ae710ecdd670cca9dcfda5dfff75223726159d9568. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/USANG2229530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895325d8f6fe01e54b8d81ae710ecdd670cca9dcfda5dfff75223726159d9568. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USANG2229530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578b88e532039a178de91432d9990d89810685fd2b2eeefb2a6e3eb23f3f5935. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USANG2229534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403d1164ecafc0adb1dc8d9ae7ffe021a9836c75a0ba21e6b2538dda076cdc70. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USANG2297178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aab460100ad43a0a0b14cda2c5736deaa1daee3d6e399b2ed88092ed6824cd1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR9Z62300543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd322cd09410127acd6c46b9e8eeaaefd452b91b37922dc37bf816681db453206. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9Z62300544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccc54454fb249092c5bcb07448fb24b50a0362d887fa4a0906ab722e0c83754. 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/FR9Z62300546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd322cd09410127acd6c46b9e8eeaaefd452b91b37922dc37bf816681db453206. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR9Z62300544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97fa6c391a0976731477796222d0eb27a561ec6d7afbd8cba76f01090adcb84. 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/FR9Z62300545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f39aaab98f685d79ab08b37bb849579fea418c9f3d9696030f7003456b4735. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FR9Z62300542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843c3c1e3109d1f36aa55c2392a4181e6a754ab7342a1398c1f6234bdd1a2c13. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/QMANG2255532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90a6a4a08e2ae80688e6b17458209cc9756614326ab615aebe640a0c9f1a7ca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMANG2255530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060ab64425907e4ddf5355268c04231044a2120f702a4894c99074a33dd36c1a. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QMANG2255531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf4152e8650496fa2087a8ad77380923a458d21b131587fa5155e2f421985f6. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR9Z62300771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1da0f0bbb82d661fb70eb13de9b620a17f0a0638cc2940aec2be82caff0181. 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/QMANG2255527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x396522f3650bc946e41bf0b91614197028f37fa21dbb9cd51cbc759b034527c5. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QMANG2255533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a24ac2b3f3ca9b23669ba77c662672afa1c2e020b1c5bf9b0b0168996e40c4e. 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/FR9Z62400710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e903d2ec55421cf3cf7dce065294a303830320953d01c5036357962ade13c2. 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/US3DF2472065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8405150b1f88a5c916301a35dcf6faa2aa6dd2386ccc7a37a65f53eb4613ac58. 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/FR9Z62500315.