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 0xacf1f3ca2c292d97e9bebedb1947031b60d1e4ae6d18bab8e8ee17b25d5e20db. 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/f6c25157-d0d2-4cad-a3dc-517c06908a33.json and https://artists.proofprofile.net/proofs/artist/f6c25157-d0d2-4cad-a3dc-517c06908a33.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 0x56e4ec021936cba657bf3efa4650fa96835ffad2c71a87a35c94a57c2ab08b35. 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/QM24S1650275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa87d864eba156c8b80eb6ec0cbd236d8740a2bd7f6991bffa1adc162889c9f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM24S1700418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770a4de1b1088efbb34fde13e94d3d051ea179940b557d06fb2caf0bb48b1e7d. 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/TCADP1896493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7d918d9f7746af69efd02a4a53550809188341fe43d0407a538f57e08301ef. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM24S1922281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f0aa4347f9fbc535dbf2048b358ce665216ffa9ae6dc3bc250a7f0ab8c84ee. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM24S1918475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947e3f03827e734554bada8644db27c2415306083ffcaa8d16b4c7d72096f852. 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/QM4TX2180334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23bbcebd05211d5e46388100b79c9f1f3f70059188067c8ef0380f28e30e171. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6N22168487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08aef3ca5590841315d3fbe6eab25a1635e91b6c256ad4e691cced87d1b941ad. 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/QMFMF2114296.
Million Dollar Smoothies (From “American Song Contest”)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe95bb8977d6beb99c9e4642332c45169358d10af83f9f5d8a4c8b4ac20da61. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QM6N22286004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad279cb5f8af31219651003be3f8e5b5bb9ddadeb1e50edbb57b6e72b7659d98. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QM6N22286044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27d7264f90adedb1069ee8e4d0a6e747398262fc04fe43d99e8cff82cbc94de. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QM6MZ2221512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7bfe75c018d12d54a5df38488747d2d2bd06cf3cca50ac95af432c6c3d3f42. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMFME2107749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947e3f03827e734554bada8644db27c2415306083ffcaa8d16b4c7d72096f852. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QM4TX2180334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdf77de957eb8075dcf7caf6cd4b29d5ade93e3b8669ef930ab190d1f7d1193. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USAT22202496.