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 0xb8b5817a753c26fa03ff76297d86d3c53c6e9912c258f6f2269e69a8ad73de04. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fc35eca-824a-4821-a08b-347566947fcf.json and https://artists.proofprofile.net/proofs/artist/2fc35eca-824a-4821-a08b-347566947fcf.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 0xe98a6caac48580dd3b32d91407f4a049f29cabf151d9df9cd9b30c2fe6b19ec2. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NL5KM2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75a1983a968621e2e1b31549a97aa41f79eb8072b8e2a8e5e6af17c1a51af01. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL5KM2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9866cc3cf3fabad1e07aea864c55793f88125547cf178c5091f36f126fa1f0e8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL5KM2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ebd504d3a94ef585854a95a31d69dec15c1c3196d07a015e96c4b324be4830. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/NL5KM2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd78f374f3884e3d63904a5305d926d438ec15b5d0663bb218d48d5d21063fb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL5KM2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd822940283328831e545330446a28482df10fb7809a8753c9da1e9cdaa0f273e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NL5KM2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba3e832ca34f0dc30c185499a5f58503b24b07fe1cdad65deace4c5bb41a2b6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NL5KM2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba866d79c6c27a7bebb6947d39a78e0243e345348d22553a39e536f784af717. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL5KM2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc3f382e9acfac5a2acd048fa5b361eceb7847409fc41a1ac65abfa9047bbda. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL5KM2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a29a1d05c1b89c24b681801756d6072fed7327307cf305d6f2067c3164a063c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL5KM2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be79fff5ef275727b74cdbc1ccadcf2fbcf91f8ebd66d8ccc747582bc2e42f9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZCE61817304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc893d498292c37c96893911a99ad6062b7b35d3819a53c300af58a4cf635a5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA41850904.
Het Gaat de Slechte Kant Op Met Mijn Pessimisme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf931aa489f2b0f9596d326d96261c7e0d9be7c04a8586a24aa6f265085fea95f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM4DW1860570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9f87d43536557fdaab0990c54fa1dd99b7a13f14742562a37b25b4c7c84c75. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZWFN2320428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaab53e7ac2cec2a88f06c35f4529bb51bafd4b0cca83c4c3476d5b5f8ac6cf4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZDA52339755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9792143464dc4e01be3056b0c44a990e9035b79b1eb822453601e303e10849. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB42422145.