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 0xa6a167b6e05fe99571416427cc71f7de6a56666f1aef910b15ee4c53c762f300. 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/a3130f66-5ebf-4773-a76b-c38030954a76.json and https://artists.proofprofile.net/proofs/artist/a3130f66-5ebf-4773-a76b-c38030954a76.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 0x0a5db0500e87e41465ea58ea516b42d8792c5f15eefe4e160e8503cb9bcd9000. 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/TCABJ1296090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e9b8cdcbaefcaa03e6a846bd11cdc7addade99f2f53dd335309a44bc5543a2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCABL1349182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf010f9c93aaa78b24d05c97b7770dfa3c2ff3342c25b71d83a8cc8db0cd85e98. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCABL1398305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5686fcd34fa5785f4e8feb49d29358b51fbf835ee4a76bb8bc11b5b1c3a6d24d. 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/TCABM1326201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0797ad5f0b3b7d436687b32b33da5f8b5836ac959339a0f3a59dd14063af62e8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCABM1326202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abecb1b8ee6b4ab6ccacff54da7af6a423e28ef669b7b8cd3da094e90ee0292. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/TCABM1326205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09f4ec3cecb17ec8ccc537e3acf651e2675e2b1d453469dcb4d9fdf0c3387b6. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/TCABM1326208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2864705fff9f2c61214b9eec24f779745639edde81dcf2793aa2f2e372b8d4e. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCABM1326212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e44c77b27e256e6fbc2ff94ca6ccd06334c36f5f5224e8b4649fb35aefcfada. 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/TCABO1358165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34965e780b50658f8bd8a3a617df68f7e69edfa3504dde8f22af92e1ce4f4ed. 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/TCABW1445273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2329a246c7d209028c98037dbdcf22a785e3dc582247afa48cf6a92381cfa9f4. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCABW1445277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f741d1af6577ec2b324be02c2cdea0d0b3d294d612e2e820bdea48adefbd0b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCABZ1468473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cecceb63148784591194b1c24cd25c1dfd07334da07dba2dfa21682067ec4d2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCACI1543907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e86315f8e1769a935e9b687446073be2948a836118fdb41b7aba993924e0e29. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/TCACT1682491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e478dbb436cc20d3aadd05c4b76ac37b7eeed62c131146c9fd88eff29ff6193. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCACT1682507.