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 0x112f9bb246a4d90f3baa2b2d342575679ed356a73505b94a1d35b6e6afc7a3b4. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8b46a33-c76a-4029-ae79-7b9b1bc8d099.json and https://artists.proofprofile.net/proofs/artist/a8b46a33-c76a-4029-ae79-7b9b1bc8d099.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 0xfd4637432cab5963b39e4dcc101656e0ec3a80ff69df38b79d82ae46e72562e0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM6P42592512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c6c59ef185fcb80882f8839b5cf9f9b965fe5aea77e99f334a460593042cbd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QM6P42592513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23e46fef2fd1c13ee47085fc43067462a52544a2409185e5904b98927f617f8. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QM6P42592514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ffee1ccfcd0ba61174c9c3d85200a215168ddac7106b29b6f6b3b0cff4e9c5. 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/QM6P42592515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4449003cfe790ef268196037a83997a6dee16ee6e78576f6e6bd54d7bb24b373. 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/QM6P42592516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f3776716137bada16a53232f445280f52e17864b52f7ed8aefcb3bd9eed14e. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QM6P42592517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81d2d1516bcaa31e21db1d011501b36fe59edff60f22d89cbb7e4a00e2fdf51. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QM6P42592518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b7af8787f1592b04ec38b6e6a0d4ab9441aa1438acf567e2f0bbcdf9ab07f6. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QM6P42592519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a54445b290f9aff8d9e5f1d5d19869d2b5303162f9401a0d3703b5ee1c12de. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QM6P42592520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb59d67463905b678d19aef0aec487f69c537511a09683f1d48ccaefd418bef. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QM6P42592521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa138fd0c5b233f52b02c6dcb80b7fac7d241208ba4c37584da06f635406b5eb7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QM6P42592522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bcba33488fba1980e1ea74f13f3f5b1a885a9446973f7aa822c84cb34f578f. 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/QM6P42592523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008caf2b1828281642b1187f57bcc65b7583430e920da7662d0306f32393462f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM6P42592524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129d5b50366ab96572c4f721fbd359f85fbeb472fc880fbe9169b4c94cf4a40b. 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/QM6P42592525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68be30f4a79f134c253e66131d8730e395058ef44bf18f220baecf107f47498a. 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/QM6P42592526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99b8aeb42189493bab1adc3791b2394bd35515dffdec85e18275962ed92e755. 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/QM6P42592527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442e733c784571544584ddb64fb0321784798e0ffbf09322f579361c5f233441. 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/QM6P42592528.