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 0xe48998925b63f41c84b68cb2bb324ac07b96f666de76f6b3d6672fc222feb488. 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/722df8b5-3257-4d00-9d87-788fe44d1abc.json and https://artists.proofprofile.net/proofs/artist/722df8b5-3257-4d00-9d87-788fe44d1abc.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 0x23993b43cf3b97a630b3b597483e2707cdee85e43632e7363dfd26f8f063b1e7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES81973326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579c87e7084ee1e8189d53f34044b7b79641a373e95b66feeee2e9de5bf8c5b2. 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/QZES81973327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748b724eea09d7ce93e00622b634dbc79fc76d867dbaf51c9f661b16a6d2a066. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/HUB071401497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb023098d0d7e8d4289594e0da24108abea20d31f0ab4329dc58ce3a8a91531. 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/HUB071401499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f98314eb954e5928345b0aa2ec64ccb889b090190bf61abc47a772196e1c41. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/HUB071401504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022c3a8e445128b5e2f4710afbcae48618355216ddb65af11013f64f966719e0. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/HUB071802510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29acaec95403eb107a71799a0a5eb2056268acdad9abe5f2c280d1c75850f96. 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/HUB071802513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf743606765b473fa708d4df6c7ccd0123b39f548646518d5d54996bd706e1738. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/HUB071802517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc6a8bbc13746802a749ae700030c8e7a4411a412c26f45c904f365da873452. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/HUB071802518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64a65205b5c0015ad3eb2f3241a756edd9dbc212708109f425586f6697a1b7d. 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/HUB071802520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe5f8a4f0382560159962446d9b26ba722d3e502156d6c99ba3e3ad6ab16292. 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/QZDA61979851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4562f662b19ec1ab824a97106fc6aad1c10e2cbfbd5a937cb85eda0b5513d340. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA61979855.
Bartók 44 duó két hegedűre (Népzenei forrásanyagokkal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7975db08fa2ef177823bc7b00fc1183d6b4671419bbc17bde1ffeb2e8d5eab8b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/HUB072203406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37949ec7ea3f1f2102a295e266903fb46586970c1442ac4fc6a65a773a4190ad. 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/HUB072203407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf320c74feefe61fe4eedbc27e39a19c9273c46971582a6307f431cf9cd37fac. 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/HUB072203408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880bbdb787cb2db7e4cf7078c8be236b6fd35946c025a294b7a3afe036262a7a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/HUB072203412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e48a9a66c3d6309bae274f470c8af894d2b85be916c8aa80213bcb16154687. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/HUDAQ2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73419398c0cd7ff425b1ab113577478f3bb63a4a3c341e9e4db6c1a85f5fdea0. 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/HUDAQ2400020.