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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf31bcc40ebe260dd3d556759c52646eabc8e6120352385828a6e820bb27b175. 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/f6f0a5e1-dad0-4341-ab8d-c4215b4a500c.json and https://artists.proofprofile.net/proofs/artist/f6f0a5e1-dad0-4341-ab8d-c4215b4a500c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f1fd196aa6bf544353a38fe7e0539a55290098784e82428388c870bd16430c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZHN42347544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3322734c254227eb6c3acbfa0a3b18e7945ccb094eac3cc8ee0bdbe7a549c0e. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZK6G2384044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff4a9b37dcac39f9170a7cd6d3f085b2a11438703a127aaafef1d9de45d1090. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZTAZ2344792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b25630cbff3c877a95d97f7044f44c6dbd06095872a3de5a1cf2ec1f3c7c6a7. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTAY2398734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd1dfeaf3b37c36001c6ab9c68528df8e2e3c609b14ef18e97c15f5eceb078. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:10:13Z), 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/QZTAY2398737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59859405e449fba7948aff98cf77ba76c90bd94aa03589cc0153cc6e1ffe332. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTAY2398743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d358329344f67423c93fee2844e901ce3644f151ccb4e0cabd636fdf0f33b9. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T04:26:55Z), 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/QZTB42391401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d429620b3c42ab51329b88babc5fdd3abb8bf7265360cb7efbcd9f1d7cc419. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QZMEQ2423734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9c59465bc1fd1e88b491f6a7989bda574ec2bfc3d77c511fb5552ddb8932da. 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/QZMEQ2423735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae4771964ef5847b415fcd31a3cc6c5d5a2ebb397862680602d755d1e7548ce. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ62439730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9ee4da93b89c0b72ab24e12c78463e5835bf31746694ab01b2da889cd81e85. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZHNA2439420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82f0ea4cd3c044e9cb53e2ea6c81d996deecb5331295170cfc6025275497589. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZDA62471221.
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 0x613909ff066246e14d779f396b9b031132ce724268d57f274d661fd459364d75. 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/QZWFW2462593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68646806193150f99bab57f62e8cbfbb8af0684447a8a189a63ea20a90238d0e. 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/QZZ7K2489050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b14275d0b32bc981b5b09a8b1694bf24333a2b5203ddbcdec6bbb1346267a3e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:28:26Z), 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/QZDA72548535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e110c8de828415689a7f43547e903944493800591c299c7976f601cf5a832f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTAS2566499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0a35b99c06521cd99adb1741650892cb33061602c2b3eb28a768aaecb880ac. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:53:10Z), 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/QT3F62576315.