In J. R. R. Tolkien's fantasy writings, Isengard () is a large fortress in Nan Curunír, the Wizard's Vale, in the western part of Middle-earth. In the fantasy world, the name of the fortress is descri
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 0x19941a78a845c1a97102f559c7349b8a9cead63136c91bdf69cbd815243a1f13. 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/36771d92-a564-4d66-8710-a94906fe5589.json and https://artists.proofprofile.net/proofs/artist/36771d92-a564-4d66-8710-a94906fe5589.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 0x40efe7e7f10a2dae56499023ad8d089587ba025f5ad084ed65523463529bd4e6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GBCQV0901118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6e94284302a3f524f0895b4533caafc9456e1f9edd8e0b7f374bdb54280e35. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GBCQV0901119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121d987328c06a17ae4f88dee00b96e9112d249669304775c2e9ec7059c7bad3. 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/GBCQV0901120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9f2dcb7fef9b5acd058565895d7357fde39b684898e9b285b448ff8c5393f6. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GBCQV0901121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf28f870dfd43e4714e35af2ee66d38fd32939970ec4858af74594a4480a9d95. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USA370517119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7614c7a16af3842d0f1e892d3a2623ebe70485645094df81aa2dce35d4922ddc. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USA370517120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd527d339730f9c781503521b1122391589a7dfb8d81f7fbeaa266394bec136d2. 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/USA370517121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8a551cb1d06b6e1b8e6c50068a19877f7b88cc8115306013dfd31506982092. 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/USA370517123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557f358feca0521494986b9bcaf48a4cb9914d03a416609988dd91581b5194fd. 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/USA370517124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941178d43eed426f5cad07da1711df0ddb0cc857c996f42313cc7c1e0888c07b. 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/USA370517125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54556396816b11fa6097c66d5492efe8998da7ecb7c9a5d7abcf3a7eb4479291. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USA370517126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32771086609f1aef6cc2f8e0ebf4535620b7f06e03951acb2f0c4a7fb7ed8475. 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/USA370517128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18d5b64f6cc556db0017ee701d08b64a97bf2b735eac0debed3d1645dbffce6. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USA370517131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ec0e9cc31d1607a72a14514e071121e8fae236f423bbed36cb6db25b0d665c. 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/GBCQV2000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9e9fd7aad90b6472983bff853dcc6e747ac9bf867ef53ce954b1f0d42fb132. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBCQV2000341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c7a695b0abdd1991bb5edd96aacbffd0f533590ba0ad33e04000720fe4cdce. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GBCQV2000342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa76ed9ad096163aa8b3dc178c648f5794d10b6571c1ff2a7b43c65251f3b39. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/GBCQV2000343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd80572502de79120fac63ad7693a9641688fcf27b57072adffb36986affd61. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBCQV2000344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f95dbde4ac0dafce7ca8c40848a07312aa08ed546ff2154ead66b7fb8b095a6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GBCQV2000345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42df4080191cba642233d8a7315e3c85296cb044f572e7154337a52d78c373a8. 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/GBCQV2000346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577c7c6891b952450b360989682b2cb03ed2a12f99d72d61738b167b1209bbd1. 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/GBCQV2000347.