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 0xb376c04fbec059846f39273f81f83076c71cd5f7d8429e2aa4543bc28e482df0. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41c1d851-a649-4026-a22f-f65351f596f8.json and https://artists.proofprofile.net/proofs/artist/41c1d851-a649-4026-a22f-f65351f596f8.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 0x3a9a81ab411b8c4e815372d97fab05a149098b62cdc4685c37b0200876112442. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/AREA12200527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfda3d7606b7ffee57fe97975a4ac78486c2f428349eb46426d7deba3d78ffc. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/AREA12200528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb26b64920b7e09376a15aaa8f77ec202a3384e258dca0f8bf546042ab05afd. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/AREA12200529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c19f01e08cfa6b2c7f30ef3bffecf9b0e0849b11bb5371dba9a045c97321617. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/AREA12200609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a07e213fc964dae7cf87731cbb4d0450cc96129632cdfff59e9fd4c1b30ec15. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/AREA12200613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce1fc6dcae3b8c83dd4daffe4c0e2b0a5be03312e4fe03e1da8fd4607de718c. 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/AREA12300829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb7f30228fdb03205bc123d90567aef6f37b10ba93de5cea1c462f5d04e67a2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/AREA12300830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5d0ce6e4ffebd463418f345016de9f5c7812ae6f197b9dc552aec1b15f985e. 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/AREA12300850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e8e8c75ffb39d9fdd64f2c76a94d20bed47a9fb2a3f001442687c248d555fe. 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/AREA12300844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6537d8b3aabff60ddea7ded241c2c138f43cf32c740a7304df1f438d74e355bc. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/AREA12300845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc574310467dd4ab111d1a04324d74470c5468855d1f6916e49fd676b12650645. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AREA12300846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf524eabf021f410704d0a4a8c7275b08a57a140e0f0fb71f1b2850570ad1229. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/AREA12300847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbb3b5577aa680001975e6ca19686fa08f9215b0852c6289c53134e7e92c74f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/AREA12300848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af7939965240df99d23de48e39c70db916d16abf0e520e716f36029b204ad8f. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/AREA12300849.