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 0xd979e28defa2b9f3b79d8890472277d0a16a461a1a9a40c11971f076dd879dda. 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/d56be002-8cb3-4c02-afff-373244fb8dd8.json and https://artists.proofprofile.net/proofs/artist/d56be002-8cb3-4c02-afff-373244fb8dd8.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 0xb23df053db0419f1a0e97ba9186198d20cba89d05ad051ffbbf488da2c1ae3d5. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:36:01Z), 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/US83Z2121857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0747fb7e3f2a9ebc184f39230b6f7702a22829518cdba026ee0400f5d00e4192. 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/UKU332100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbe904b4c6545bb8fc86a7c12a83da740b114554087b2478a98d69f6a2d6a4a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/US83Z2137295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf219bea4f2248238138d0405e8df51db2604810eeab22b28bc5abfe620d3f9ae. 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/USNRS2241532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f71af3f8356caf465ce77dcc9b5369b42b8d418f0ccc5123eda356b210d5fb. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/US83Z2327157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1509d9b48c934794b30ceb59255e40e160b17ca0505b924eba976a234cae663. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/US83Z2327153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d14656db52973365bbc40d865b2c1c9fccc4291e1e67d584b94c0eb6d5fca3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US83Z2327161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95af39ddaf1104855992c118ca8b7c433f51c3701bffda5ec01dd65769a9ba1a. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:39:30Z), 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/US83Z2327155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4a0d5ac213807a06ef469722024d1c5250a29d4267f74249b1f69cf58784f6. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/US83Z2336272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430c38f4179a073d536e11a9d936604e9d4757892e7374f8e22f335f93642da6. 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/US83Z2460952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56809c0e1023f3349ec4b4a441b5c21ab10ccf4d68070c488dd3cf7c79b6b0e1. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/CA5KR2451170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87ef9febc60db5ba9e78e27e8aede9523f89f385458ce97ead3611450fe2383. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ITA061302728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7cb5eb8ca67c1e360d46f56ee976a956c03386e540546c466c98bd0c19402a. 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/US83Z2410350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8be4ca1105203437aef8ba16c7c257eac5a2e30881435a71adf0ee9a4710bf. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/CA5KR2513457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5c1ec625e586798b563ae4caaf926a226a9cfae7a71021385f43b90e59e2c5. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QM4TW2537430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c6d5cd3172987b601f9b5016a978e112f6c61c62d0d18e2fffcbcaf677ff40. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QM4TW2537431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36550406d6af4d7b47f6dc7f9e51604983348b3bbdfb21039a6488f95322c6ad. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US83Z2514633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa321ab2a855ea6880844c1cc632f3a7af378b461d916633db199d6576b6f24a5. 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/US83Z2302386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff61f93cb66fc6e03ad6747cb23e4c259e6826a03dc504d04a1b39b118b979f. 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/US83Z2497738.