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 0x49da7322997fe96f27bf88f05204727e5c398bebdb46984f6be30a36be839888. 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/033a9e85-4291-4c5f-978c-89eefa2e0634.json and https://artists.proofprofile.net/proofs/artist/033a9e85-4291-4c5f-978c-89eefa2e0634.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 0x679c81969216684f9e7bb46d4ee2566190ffacab4a87aaf6cd322f8b3be9c3ae. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZZ972479104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902e4ec48a0c76973e858b6152390da30bbff7c7c1b58dc527f410058f3dd03e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKD012371172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2e8cddde9c2f5bf99ed01c3226a407264bdb1b6c485593dc9e5a1125f63e4a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKD012359461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba740725794aea873bd0065753acf53e50db9542b574f55eb5bb0c069be4622. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/HKD012355868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c41a765150852987c5efe89d3607970342fb4e1dcda8bb81904e27da98a608. 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/HKD012355864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020aea704fa22e5eacc0b57225a74a10f5f9c20aec7ed2a30acf28e9bcd4dce7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/HKD012318610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5908c642d21cf27c2aacdf18c946549961c5d7045bf3b1580c61971dd23818. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKD012318182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237ad8d06e1ee00db6b9fa627064133a7b86801237287cdb5c944281ce2c6d9a. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKD012318132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6133e304e0c86c614fc70addfb0e73dd4902e65134cba7b1cc381387fa1865c6. 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/HKG732428179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1025d8a2a536853bf1050c2df5f42d9fd96275a2e2f8658de655736dc17ffd8a. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/HKG732426819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed4eecb5192ccb1124114166ef8e3d85df4e468f97aa483c7645f779d50f7b8. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKG732426816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9adda4bc8124e232919cd14ad1ad6fc0537746766eaefe4599e85f8c8cb095. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKG732426051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5e8f26b784a95284cdde9efa4cbda7e6ac84b19ee9a003cc141dcf7ec0e268. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HKG732424025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1127c3bc75dffa2e59f7ab23de2dd146e45b040fe120603facd2ad6ce0339bd9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKG732421981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65f9bc3f8b03f1f1f7fd9760e1e4f5e82024a24c45e3b9578a40633a17948c5. 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/HKG732419696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6960a3d32559d38a78ec34960dc5c783b67fe50d543de3913f6f02f11e037b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG732414273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce581d07b15d59c70beb4c4df7b1b5afdaa00880252a840c2f93b656b7268c5d. 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/HKG732412836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82dd46ef2cec6bac201a786f405ff2a3211973ebd3b1b23b84ade5dc1bbb83d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKG732410266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c33faec58e2c37463416e23dbc16d69d4fced37b6d21554efdcd2e7b33190dd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/HKG732406270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8c0f83ef648a74433cd4d4fa944d3696dbb62f09bfd754fd68b94f452d3c92. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732405549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea4ed02f3646584fb3d0b8370fc88ca9a514b91a5ee58fd3e340bb032478dba. 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/HKG732402277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5973cb816c462f53c30702c3d0d7ba5cf14d65a0741fff85ef0d6731c14cf9ce. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731698819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef55f3785a0e64dd76e5a68a689ce994789437ddcb4b5ec4c8dd51a7ae05138. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG731682483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16ea196644ff04390a2ce1b8c45d4763c8d263c88a09b3a8113c1cf0f32e299. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKG731681849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb531512e363a340809d67f6beaf2629449dc3429df8e00e22da733b7bb25da9e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG731679108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75faf9f3e2d3dcb96cec7af009db0df726318c8d0c9f30fb009630698d1f038. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731675408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0a1c909f8130d8242183897b78737f507f2acc4ba572d284c89b06c55c21ca. 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/HKG731674001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb999d871e021026805696c489c4c57d8c49a633520c161e1a4507dc596e7c5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731670068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf148d60d464d6300a29cdec8fe4d1a471317a5d71133d6f99207acba4dfe1047. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKG731662343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04446aaa7931f8c4d5ea64b3a44dd80141a1467cb452965df459d0e8e3c232cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731670072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fa70a00a777d48685e04d690eff75d4470f9e653654e9c06728e13cd605ec2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG731657849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d993e431dfacd8add856cb69789cbe462d714dcd95df6eb31c9f26822dd19b0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKD012502511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d83925c71ae5499cf4f931731e8d9d4a745e3a8eaea6c762d4e8eb4da5d72c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732432140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce581d07b15d59c70beb4c4df7b1b5afdaa00880252a840c2f93b656b7268c5d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732412836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e70e338dff1c911748353d6b056c98c4485f0b86a42263daae3f7cd5a8e3b5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732402283.