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 0x47a220415e72d714e783a00ee2a9bf0ce72f8b6cc240c7d2c76bd1bf44f7c167. 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/24ccff29-0cf3-4a2d-90f3-a5cec1637300.json and https://artists.proofprofile.net/proofs/artist/24ccff29-0cf3-4a2d-90f3-a5cec1637300.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 0xb7ca1ea090b0b1a2e958cc1f8e564b99e16d078456152f93230f53d14fa22307. 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/TCACL1695229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b72666e30af0b764d3462a8a893ea51169d809f819070215b19a0ec93841299. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCACL1695230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a193835fe8bdc4a8ca99de7ae33629c76e6de7a5d36fa49cd011adb069c2c4c. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/TCACL1695231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813f0e351e88bb3ca1ccfa6313d7296ad565655c8d07abf4a5ef794c1617ab0a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCACL1695233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd6a963006d159e35fc9ec1d21a6754cd4d8a10e6f72e9635f282d89feed72c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCACL1695235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ac30a5f8a2992881c16d471dc8998656678c3cb839bd2f4288de399166f6d8. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCACO1640819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc8883c9a7ef26c25948b81c2311269b6e63a606e5a1b1b6e928db9f45c2747. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCACO1640821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6834cc388b36ac656eba047d438f8d69dac8bb2f6217630b82547cbf93a2a79. 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/TCACO1640825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98618f7fe0a9ebd03a050925f600dba5596e829601b78066dd35a410e409945b. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCACO1640829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f1d8e6b67360d7332f4ac2bfbcc6be0f72e9d6202186b8219d83077901daf9. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCACO1640834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67e3bbab3a357edef6c54fa017623eb316ae426e497d37b771df01a4a0a6d40. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCADU1812661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d38589cca82e25b7aaa3238ae07d046e999b5518e4be5de25f4dbd935c565ad. 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/QZHNB2105706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a3ca5feaa07589d70a0ae97a5ed3dc47b32725ac0e6db03b03d5acaaf0837f. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHNB2105708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc68ad72cf11a5195dba35176e0daeb0ad551e75d4c24172689010cefd9413c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNB2105710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd76de10be960e307880c0483d7890bef7c4865243f63f67afd8cec31c411a0. 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/QZNWU2132071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052504e01ce049cf348507b5c869a516a70ff3ccc268a4d62d387f7794fe94c0. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTAT2175134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4610c6ae98940025501676ff33f3cca1799ffe60d512bacf1fddfa914524d9ff. 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/QZDA42201210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b35d801369d0b0cbed2d2c0391070cfa205e7ef1d1a201eeebb1c325552ca46. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZTAZ2335320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf101b2aeaa97b5d516182d5d9b37c0cb16aa2164a878010f1b514c634c7a9ab2. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZTBE2318549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bad378098a1048f1afdd6f4c1839a4097b2833c8f4189f6aa44b2d5781e4ebd. 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/QZWFP2399708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ac7bcee0268e3e7938a3e5b6ce8cc09c6721196068c5b7cc5abf624d4ecadf. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZNWR2455353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7afd2e6cf73dce9ed933d19fda841cee9d96bb682963bfb182a532c00b083b. 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/QZZ762436252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb600c260a0a4a673852616267e98bc1cc283253b71f4bb0a5c944bd248fd13. 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/ATFF42300001.