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 0x8c45915e4a9842379520c2c5b9bc7bf2584238aac4bf255d2c4a4a0383091196. 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/e9e2cb53-f83a-4c13-a659-37d328ffa848.json and https://artists.proofprofile.net/proofs/artist/e9e2cb53-f83a-4c13-a659-37d328ffa848.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 0xb8c50f93f1a8c4ed171b53c59cb30d9f47a936e8b388047a486767a61b8276a0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QMBZ92047739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318f77c470529089389217e41e21b173de88e5b2efe6d1b442898b2844a98996. 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/QMBZ92047741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf822822f7aae12572cd75d3dbe1fd5c5c65b7fece8686671e4bc33a3dbc167f6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMBZ92047847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798eab38f41b094808ff3fddb302558065b13ca246df14333125338d7ca44b77. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZTB42435806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7387cd6e807dd9e32382b0457b011b8df9d76542645623c40650e58bb5d3d5e. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTB42435807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6a13e28755407bb04f47edb2c546d4b7b269a4857785a9df44495d9449b69e. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZTB42435808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf151c7cc8fd3fe433b432067ba92412905a6e8b86a00bfae153e193d06937a85. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTB42435809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6ba4a0d565f847ab46f8ccc340c2c16f03ae771a331aac3b07dfbbacb06ac6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB42435810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d04c54940fcf7afb34a1127b49910fca777132cf295d950fe3352425833d07. 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/QZTB52488420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2a456268c4f33eaaf2d59fedc395fbd015a8a2520cbb2f8e226b7de4233cb4. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZTB52488421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2820bcc97b1be6e00f17edc68d2aa980b7a2d1703c04b49984da2f3cd2e9af2. 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/QZTB52488426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7359adc82f3d277c4527df59511f06dba3563f05c6f73d5604d9591d93137c. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZTB52488427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0be443bf81f244f9f7f83c985045ff049d9dcd7f3b69de77f8d94bfe58d9162. 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/QZTBB2494805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1c3479c597e018bf6a531a82f259d0ad689acc901f53189c668a7fc8e0dca3. 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/QZTBB2494806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5598615ba01ad1a803c86422870c16271c269570bbc8178afe3c74d19b8f6cb7. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZTBB2494807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448fcda24ffcc132da769f3e6069a011afbf6b19f69c637cd7198339ba64b5c0. 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/QZTBF2486683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a36fb04c308706325ae10e7fc8803b2799ffd88a06c558c5c8459d263dd093e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFN2447409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7148004f5e29be8fe233c10c4d38085447fd49c2fabe22cfe2de7188aeaf917. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZZ7M2450649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e3f543f039cb44faf21ae6815501b22a644d7fa3a84afe5735549efb98ece7. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZZ7S2457929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13fd45075e5937bad2551ca4b8adb39f824cfabe142b823838d90f445473de1. 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/QZFYZ2595306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6fbbcdc3743d2eed6955088814e10ab8f1ac740bf501555218ac34eab1388b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZFYZ2595305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d72b56256f52d5eca959bf2807857708f11f20d86fe4df077116142480b568. 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/QZFZ62506160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b08f016979e2907ad05026a6927d9b7698ed2e824a33c3508918649518e7e0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN52557324.