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 0x09c64a0669e7b72fad856060554a499c40f0c6088efb0371d386923f6f6d17ee. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bad5f9fb-2bf5-4235-821d-dd10660fa1d8.json and https://artists.proofprofile.net/proofs/artist/bad5f9fb-2bf5-4235-821d-dd10660fa1d8.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 0xb972c94bd2b44f21f2a1fe897524b7fc7482e878401c73fa63fa8ccb147b8b94. 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/USA2B2204845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04de6042bb040f9ab146418589dec172b180b8b97efae5a0779460e26d18d44b. 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/USA2B2204848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c243174000451f1108cf5e6fb0910765b5c2dbaf53d5a819ce35b064086098. 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/USA2B2204851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa350713a9866c1ea07783d28c112375ee65c04f523ca86122a939362f095af. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USA2B2204844.
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 0x66ae7e4de9dba787d03fbf4c3946ecf30ea37015ad4649e425ef9f5f843b3ad6. 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/USA2B2204846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5231864d98407f7c6b1410340d5293c3ea20f1e4e8d914d34841d2038ae7c0c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USA2B2204847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6aa3989c04e6abac087880eaf9cc0a1688f896cd61781782a5aab3311002fd. 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/USA2B2204849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7905ff0dc134cdf7e8684dc43e0be492a7d246a329c89ad44acc1903c070b7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USA2B2204852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3042e5cd50c3dc37c2065efb4b2ae326d678b25d9eadf6792ebcc3fb544eb0f9. 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/USA2B1902596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706d5b2769259ae0b3497fdf05d7d31d1387d18c798ff854d7559e20a75c1ea1. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USA2B1902595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919f5e44350279601664578cb893fdafdd5ba8be7adf5cdd5cc7e3246972b681. 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/TCAIL2498518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd4c141ee0252cbebbb8e297a2d86e633a3d4fdab22a267b85b94ea3d4dee38. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CAQCK2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd789110e37cf53394d174ee6ee92d2aaa8e7dc96a729a32ca4cef20b757ebd2c. 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/CAQCK2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a0fdfa0b8d7481c7d3a05e16873c209d93fed1c29a4a3e4d86640c322dc929. 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/CAQCK2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279d9d2422314b185e1e2e5217a1d5dc386aed2dc914787611915dcb8710e01. 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/CAQCK2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1226bbe4d4f71bf354578408149eff69eb02f636d9fd77726a2d221d4558ed44. 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/CAQCK2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f0f5a7d16e5c98cf2e9c1c77741c74d086d62f5fb051a8b9e50468fc5ff50e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CAQCK2100011.
Twosyllable Records Chicago Cassette Compilation, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62f7624dcbf3d6c181a39438bd2d977476f6260590d6a0daac89c5a8bf704b0. 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/TCAJE2522604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0025273776cbf5419e7b6ca9e8168eb924fd9fb1796d9ff4a0a061f02dd2df2c. 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/TCAJE2522619.