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 0xca19873677e21deb789b25e250255239de9b8dac1eb582c1cd1b9c7e8763ec32. 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/0d933a55-b316-4e29-a62c-5c5bc711c8ff.json and https://artists.proofprofile.net/proofs/artist/0d933a55-b316-4e29-a62c-5c5bc711c8ff.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 0xbae2f661e2e5163c76b3e5a081758d1cc954e8d9c35eacc7c37d9ab21fa756de. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DELJ82097063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b3817a19d95ec9e8b06265d57afced9a4efae7bc55717cf031c55a3e196dac. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/DEZC62115566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe64b7973e9e0562abeb26b4e559a7b096a47ea33c0006a644e80142e5e19be. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DEZC62126141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427745c83c48673929d3f8e409dac7ff4809c2832eaa65fcbc0a95483cca5148. 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/DEZC62119175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f60c39d89576f7e8cfff392e3bcaa6a56462c8f548012d3034e126fc033f3d9. 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/DEZC62130774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7fa6ffb5382caedf11486ffefc65601b9927d134b6ca1d2bc24e0238d9aba4. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/DEZC62130778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe64b7973e9e0562abeb26b4e559a7b096a47ea33c0006a644e80142e5e19be. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEZC62126141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5940f4272cb680bff6b63ae097dec9a5d0f051f60a6a3c88990ed43265c1c1. 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/DEZC62130779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2a9c6bb82a89a3dd7e462c32d769702e3f9bb3c7dc0cc40d2b8754df3179a4. 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/DEZC62130780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594a3c50e06ff28fc3ee6d0480a154cb9d113b742258c5aba6d1fd05c54e59d2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR59R2420139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93842a0385c7c3fbd35e68a8f755bc1ef459c2ad0aad1c6d9f02a3c697839cac. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DELJ81942018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736dc08c55acb0bb6adecbd62f12598a14432bea4df8e551811f811d4a35ff18. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA72136298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b8adb81330050e419fd186602a5fdd8c7d6c7ce84209cb67006d974da29990. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEQ022281643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf452d0de2241f7757b715cd609a2084c653ce70809d6c8b1191bfaa76f54e. 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/DGA0H2317442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf17656251e27cd2ec7b9cd1bdea59a5d0311f6622f14412afb9ff0ad649ce19. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEQ022272841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2f6d8623d21b80c5fb8b4876ba6a1d4f3c7bd836729736fa6f266714fd494e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEQ022382339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe5dd3152672648016b2cd2c759421e4b0a57e9143933ed10207fb8f7f7265a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEQ022391007.