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 0xcc0195c5176a91d2004b42a6e9fe3d6aec9a48800c3d95aaf912d8ac6947b2ea. 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/68051a04-90c4-48b2-8263-2d2fb79074fc.json and https://artists.proofprofile.net/proofs/artist/68051a04-90c4-48b2-8263-2d2fb79074fc.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 0x345198fb8c0c1520a410f2a51eeba2db3d77e440c8a5ee36e7754c06da2784a9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TR0191200778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5117beb7008bdf7175217a7da14bf755d35dd8177b9ad9cd758d63efe895749. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QMBZ91558726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9b53c922db20876dfed48419d92232e5120ac58c0b63cc7781f57b5f76b6a2. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TR4591202679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3991d990cd9bc4496cc64a10c0e9761de6fca67c5ca15308c8b98fdae8b827. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TR4591202675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ee75a00f705ce38a8fc3be4a373ef6268bf166329989b519d99c0f3d46405d. 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/QMFMG1547076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34039674fffaf75c3d9eba07873b4c00a1539230131074e04320d4391651d06. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TRAJZ1900074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80446aa7455e5cdc9865fe62aa7dd507ddc7045ad24e6056f6f9dbe6c2cf40d. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TRAJZ1900075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10adc004571809efb9dfe37d9849282f00e720dc8601402cefa25706b2f491ff. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TRAJZ1900081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5483f553dbdd51d5fb2b84bfbdfd1f6814cc3ef8527bd9a46f4109e4c9d3c1. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAGZ2346483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9776ac06931c0618abed1946c42d3982940feb7f13ee4b4a60ad5c261b7fd5. 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/TRAJZ2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceb1e1411ce472c5cec527c91846b0b6958e7687f705843409330a80f2265fa. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TRAJZ2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dad332fb68623c25bf290d3b7a463821a08cfd47f89e4ac7a997ef5ade04136. 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/TRAJZ2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa37fc749466fe3326a42ec0105cd06a0676aa6769047693db82b0e28b131320. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TRAJZ2500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7d6ceb0776342f5f165e489feaccbb2f5ac3c8557069bd0771333cf839cf45. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TRAJZ2500053.