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 0x7a92ec6bcfc8ff632f6acf8904420b569783984fb94efd9284ed645dc22285b4. 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/ee0fbae1-9953-4d5c-a440-932e3900aaa6.json and https://artists.proofprofile.net/proofs/artist/ee0fbae1-9953-4d5c-a440-932e3900aaa6.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 0x3d7cfd784411e1327d67450db986297c05defa1fabe56725c1ca0ebc82d40f32. 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/TCAAX1161566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746660a2998f96f0e5e022063461392e00c132a098ace00e2b736f39cf06fff8. 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/TCAAX1161568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42d2d56c21b847e5cd156d07c09cf874744e00c9b1c15979f7fcb114dd01fd3. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/TCAAX1161569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c6c3d425161fb2f99d62aa0764f9e013427770ad307ff0e25c3e9df356b7dd. 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/TCAAX1154987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a7d00bd12e8c585fc7f62e61808c1beac2877788acf9801e2d7984c685e852. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/TCAAX1155026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c7fd86da1cf1c5622e4bb22c1be89459fbe8d7c648f34ba1434356782dfd9b. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAAX1155027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f095891e8f121f5533a19f4702f763dff20668a37f7b7ee46f9c65bf364930. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAAX1155028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceff82fd373c5499b5d0de3894cd4d4dfbbcc4c718d3c141d3bd8dfa6efaef5c. 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/TCAAX1155032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfef64f2259632dd564085b44e25faa6c42f0ff8302a419469530ad04424c5db. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/TCABB1116672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625030fabe37e19231290cd3eaefe90d852e4ae02a3481f48db4eed1d1729cc3. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/TCABB1116676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31504c08b396867b4072d2ab962fca6c7ea18bea9481e8dfe742036f40cfb77f. 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/TCABB1116681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822a383d404b1771be690913ad40a8eeee6d920ab73f7ae37f35307f4e868526. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/TCABB1116683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f213fd385f01bcca1b08703d3dfde6cc98344520c3451c096dd18692adae80. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/TCABK1288993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90613e5afd946395f473cbc7d9d614157838d65098344299701a08e4f0583549. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCABK1289001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef93e82f67be593ca2fa35eb35730dccb6247e58eb8fbc76399cae134e24ddb8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCABK1289002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefd7b5a27af55c4f39da938b66649959578db84f677e690173c1d67b16220cf. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZKSK2110001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58b5b4e146f517558214bcab1edce97a7c590a0ebb6849aeffbf5229fa937ca. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/QZKSK2131138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1403fb149329cec58f15e88d50e63a1164b0bd7e550c2c19bde5069b861ec7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNFJ2117468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f50d08781f9137bfb340dde7aa336dd49b5992daf8ed89deb0c7bb14ddc10f. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZFYZ2210644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc9bc3b7a8c74581478dc3fca01970f32b52eac05c2898262b5acc52f5332b9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/NZPB12203928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ef372b588c305d885f4c558002bcf71d5664fec9f71883f91d6bdc695c4f8c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NZPB12401366.