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 0x21eb744f0e5f5df8a44c6eb3492fcbc1f96eae7a5f44fe5ccb308a2700664fd3. 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/27012342-cc43-48b4-8c6d-610b13c2ff09.json and https://artists.proofprofile.net/proofs/artist/27012342-cc43-48b4-8c6d-610b13c2ff09.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 0x5f53459388fd29a079ed349f23ee77744fdf6ecad8d3f5c25ddabaf42c01b557. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCJPM2046895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aa0c440a64a35438a08068ce30e83450a4bf5c84fa6f20abeebf4151119e39. 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/TCJPN2034241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e5514c9de7569491f48ae512246ef3d01a108f140eee48ed03cf77740f7e9b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPO2148973.
Marine Summer Session (feat. Marin Hayama)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272fb74e39b7ae73ebbfa8b2307b07d637330ba15c0f951c3bbc679e6970653e. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/TCJPD2555133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72581922ecca2d41a66a8ac8f18d6fb772d696db7c106134235406bae6991f9. 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/QZK3Q2400262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c49fb9477f2cc51c166012a0c41a993477b41f5db38ebef2a1624a19eb5187. 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/TCJPQ2106384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f811959e7571824c70362682941be8e64c39e5d5226e0d9987f8c49c3eecfc. 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/TCJPV2347077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe941279158e297a3006e98d8c4c8edc194369a661c17dac3e2bb5b78ba9c4988. 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/TCJPS2277052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7e4806e32f16063c1c085f2978b9245265d470418a3b1ca74da5bf0b619dd8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCJPY2485345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc531c2d561ea27140977790a450dbf6cc1f69271547ee80766a29dbd3904891. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCJPY2485355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026f29f01eb65ec67db2b1f662f33f01c84f79493c9fdee9c7c9bf756da411ec. 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/TCJPD2559522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d307620123391f30f7c46d519845c757f9aced35648695d0f54879e1f3ca0b. 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/TCJPD2559526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f811959e7571824c70362682941be8e64c39e5d5226e0d9987f8c49c3eecfc. 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/TCJPV2347077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dec424ea70a241d65e171579b98d25c7ba6d11e8c8cbc231bfc4ecdd38ff60. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZPJ32162167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9660bd875d1c157a543916bc9112315bb657f9b2d5f0095d0c95611c3621a801. 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/TCJPE2515731.