thumb|GSM tower on the top of Donas hill thumb|View from the top of the GSM tower, overlooking the Gdańsk Bay and Hel Peninsula. The Donas hill is in Poland in the Pomerania region, within the border
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 0xb2bfbc1feb3467abbe4bc3310511ab336a8c8b57d07174f64a6660eacd79657d. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4900562b-d552-49ed-b5cc-19eb99d6bd1c.json and https://artists.proofprofile.net/proofs/artist/4900562b-d552-49ed-b5cc-19eb99d6bd1c.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 0xa5653568c4169fdc005a0e7450ed289423be0deb8555fdad95ae8d01bf968f05. 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/BXM841900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b883340384377fb437a2c0b272e6a02a9464cfd055bfcf7769678e82567d15. 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/BXM841800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1e21fc126d87ed20a1b1c0d5163bfdf21eca313ca6afa540f400db248fdaa8. 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/BXU551700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce336242ba6ec84f148400564454fb539712c21a8a59ae940cd69902fbafac8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS1962218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a3ac54ee8e3ccce2a9102f5755264727e2c97cfe2baf24b384725639f06b55. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS1962219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca2ef41a32dee044f13a5edca28f7b8ab6e59fc8426de821904687e62c03219. 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/QZGLS1962220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69805838910d9e37d6b4918fea6fe0a5799e2acfe21896318a2f95e3569012e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLS1962221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdc8baf8ec3937d0c6cb5b4b6407a077bb2dbfa3db23ce691fea2c1a2e6e66e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZGLS1962222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3d1080eae1ed5af696296c8fb25d97fa71a708ddc53ecddaeb6dd7f977f3bd. 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/QZGLS1962223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabf70ec02ba23a2044dbc9df45aa073e88f9316c16ba65121b49695186c3b6e. 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/QZGLS1962224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63734776366679666a6ee6c91125d015b1b001b2fd33f8c6245787741859abc0. 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/QZGLS1962225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb70e8b30a30ed81ccadf71075890c221409dcf9015cd897ca09c65eec8512c6. 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/QZGLS1962226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac327629925fe84b6d5f30ad35befb5d3d4564d0cf951e1cef3922c958d9662f. 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/QZGLS1962227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8f40222cb3245a258d919ebce40f82c4234906bdcbb2702a746e386bdc1fcf. 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/QZGLS1962228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3923518690817d0d12066ccd87acf69cb722780195d1538090b882a9ee39fcb. 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/QZGLS1962229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde620f2768ee3762ea48289583dd079c26f23da0600e4f37984b020e3cc1fa4. 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/BRX6F1800106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc593d993078ff64b0b758c5c21a2f269949cfd607f9c26e854e53aad95fd3f87. 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/BXM841800060.