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 0xdd03617af779a426aa5e557a5795ee35c4c65ceef36dbc14333cf489b88bc19e. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1f79285-ee8a-4fcd-80c3-87732e100b6d.json and https://artists.proofprofile.net/proofs/artist/c1f79285-ee8a-4fcd-80c3-87732e100b6d.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 0x937623b19a3231b38d00101115fd84ea473b081fec1d6d10061c3506ae78d103. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFE2355978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9ef114082640490a20fa32be5159961a08f5901ac3072e5debfbbc85015a07. 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/QZMER2452780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783b58a27f3d8a0828e5efed077ab901fa702387587a241ef02fcbfac90cfd52. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/QZWFV2444198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634cf0f9c2ba6bc5d08a064b93656fe792d517d197f38b867d427cffe12425b3. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZES52515433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd433e279283950c9c8454d5f9ad04c2ff4e51c1408feb7b3646c9209914e8434. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZHN62540172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9896b22c9711aa4a4e3d17d74fa0b0a93521089b3384312cff4d5f88fadc3aff. 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/QZHNC2561482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b9d357603d1f4fc4060b364ce70997ca5325749ef7775a7e3b20452ae5334c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZK6K2518863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2871bace7c249f60a8abb1566f27da05c63e1c227c020a4ca93f5a586c48656b. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZMEM2592627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a9d42c6083286fb2d3dd7ba6cbfc33696ba0e6b98f6506f2599c3ea19bd1e9. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZNWS2583203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916e71f0f0a7e8c43fbc26271f0d118105d4e75f99f658f3c554c1db578c12b7. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZWFK2539829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d5402023306150eb6b12c42a7a6d806319914a8ee876f64f6edca42533c47a. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/QZZ772545965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d248e63a64de60293ca23380f557919f19f37024e431790837b221fd951190. 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/QZZ7R2542472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b77e5cae8775fec7dd69d2d44b4d9e8af01e0e78ed213e24de10d0d81504bbc. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7R2542473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa010c0e9b0214fdaff617f2c9a28f8790152d65c6a35b07a1a550efc71b4a7e0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:04:49Z), 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/QZZ7R2542474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f64dd03e6e847d4b3927090936fff85b247f649d425f15af8de305f72a94b49. 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/QZZ7R2542475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0068c440bbd54c3309d9b7feb2bfd726a7d83565f7ee94aeec98f5633bb02504. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7R2542476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d1f2bb3d70dc48178f0e409eb5f2d2430ca122478b328707f31f9a015abb95. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT6EA2510737.