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 0x17fd76fd3d02bf50623f05322b67328ee8376fee6e8f12bf2a57c9d6bfdfb27c. 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/46fdff5e-254c-43b2-82cb-92f59c58ce66.json and https://artists.proofprofile.net/proofs/artist/46fdff5e-254c-43b2-82cb-92f59c58ce66.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 0x601226808df683ed6a63ef808fb5493e4438ace06030b3ed3795ea463ccce4e9. 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/QZHN52378143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1497c723ca50a10e514e8392e04905eecf4fb51559ae6972932cf076ad0777. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZK6P2441392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45667720b4ac7e1c41a59e07af66f804104c2c874a743d658c076a2d43e0f17b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZK6L2444853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde06f996892d615d784228ef11653be3123c98b653d7d4ea171f982e56057e1. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZFYZ2526490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03acdff5306c88b75f1aad748cfb84493e0ad943afc7ce068d8ae32502e32ca3. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFYZ2526491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6caa5fc53633d2edd7529da59c6de3ea016d7944e3027c2a7e0fcbecc684d792. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QZFYZ2526492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbcbf1d7ef934d528df29ed24bae76d22eefaccbe032988834ba8470a2d1a70. 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/QZFYZ2526493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc6a0e6b165ca8840df4c6b6a1b809accf20440d8775de0d0653e0cc1bc82ec. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/QZFYZ2526494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa084eab9b2b9a7ba969a96ad7e65185e594d0b11f20e2e16602b3ee4d85010eb. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZFYZ2526495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c6141785a447b92e8038e10715b1a437f73db3774dead784a2fae60a5b282c. 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/QZFYZ2526496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c071fd1764e1a4a82711572854f11b551b9249b602f4bebe273a0533fcfc3cc. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZFYZ2526497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611d0b8f628898d7d4131c8501ff18c955d34848bbad85dcdc4b75d20619548f. 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/QZFYZ2526499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4509c62d24abb701285234eef9c10e6d64b51780014a00e4a9a4671a310e52. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZFYZ2526500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad78d8b9f30f09bac701d4f2c98da9dd8f9da7ac5ab6ebe7c26e21f39101311c. 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/QZFYZ2526507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640a981478d45977001b5d67cff57409e1febc45036b432a374ba26c6b732bc6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZFYZ2526509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc705fbae4907d8549b81e168b31acd2635a2ebd65ba57ca3dcb2d99d3141ad2a. 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/QZFYZ2526510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5405daeb575d18f864649bc361cc69a34cda1704eb627b5e92a12166035c0fb9. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZFYZ2526512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44919924ad6a30e437e4c6200e8d3f5b94d2a05e386ab4a249085fc37928fe0. 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/QZRP42540176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b0a85fcbcd6fb1c13808a233a2999d78a4dfdbf4957426852b1467d741b6a1. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZRP42540177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376a18ef003b322db7ebc40598ee88b3e40bd22e0d76c2d5c545bf67195f285a. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZRP42540178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda928df82f71aec1ef2e1e2a123a5123d411ca9ed60ec8ef94896902cae4e790. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZRP42540179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead4e66ed819013ce3ba2f49993ed5ff12448467923918a287ad16d9b3f3eb5a. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZRP42540183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6ac611162b98d8ba00c2a8a12e086366e3a3ff26156ba355d2cc74a29d13f7. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZRP42540184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0c00b2b991cb4f18230d9002410f59979bd3ae60f3ef0dc91dda7618811148. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZRP42540185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0346dd3490042ab1dd12dc911952601f287d60a959058658bd9acc9cc3fec6a3. 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/QZRP42540188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc176e9716e6ba337690d80680717eaaaf3d8e6932d4d6b68f657857138d441e0. 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/QZRP42540189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4082bb2a1862a67b36dcd26be1ade3fe6a3bfac31e9883c6f2d84a067a250138. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7W2556117.