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 0xfc1fc40989827c9ad1feea055187432873788173dbc301b2afc83aaae4fe269d. 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/afc0c504-9646-412b-a2cc-28763bb428e0.json and https://artists.proofprofile.net/proofs/artist/afc0c504-9646-412b-a2cc-28763bb428e0.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 0xb525bc44fdf41e3897f20381eb7fbe222b5940ea2c93def7729919d53a6cb23a. 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/TR0411405004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1694f4a37902dd5b54e5c4d6c6ea50025a4f4f8a0f6b06d69e97ea6036138dd. 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/TR0241203758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350a3f70062c1beedb65e29ad9cbad083b0584f894dbb84589bbb9c1f15db68f. 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/TR2810600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33ac5d61672e889bc0f2af495e15b6f6b60dd19be51c32789324102a76f9519. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TR2810600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe547022c50572b0e8fcf568b882bdd2468198ef770dd5482a218e66f2dd366eb. 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/TR2810600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b976a6ce59243133f5cfe4b3d22d5e37fa52189a2a4987890854cb5654cbb9. 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/TRCCB2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6214e27456d75b6f9ee121e2a26585378670fcdd2b36473d11ab190e12ae8903. 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/TR0950600155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b58ef26ccea3d14c7bcf63cd209c0781ddafd78149066182dc69aaab05007d7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TR0950600156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabab1dc2d9584878c58db01bdff45148723bba8a8c0f8e00c4a4b4f8e1ed6ce3. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-21T17:24:06Z), 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/TR0950600157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db1c2088c02269d8693bee8b5c7ad714bf419943a160d62a4a7c044aa3b1a26. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:34:27Z), 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/TR0950600159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54823003940f8a02641b409e09b414b6daa61db4b6cf92964e745aa0be1bb605. 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/TR0950600160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032380fe7f1119f1b120b8fd7c8e0bdf93de8dfc1830ab3bc29abec177f2eecd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:54Z), 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/TR0950600163.
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 0xbff7d6ecfcf94ea0cd4f60f61e6b6bf254a694f4036c25640ab2b95466679ab7. 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/TR0241203742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c1fba899e1ede2c9b203eb601327a559ba91af3edaf40211cf37b0a98c6851. 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/TRCCB2100009.