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 0xaae1bb8ef3fd5f9f1d6f88635e1213b39ae990988f4e8b6f966d27a61fccb8ac. 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/26668804-b2d9-4dd1-ad39-ab5cf60ac9d3.json and https://artists.proofprofile.net/proofs/artist/26668804-b2d9-4dd1-ad39-ab5cf60ac9d3.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 0x4bbab0ef1eb4802513b0b7af170c446d0b22cbd5c595b241c485ab550f63a5d9. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QMDA72205898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7ee8db31552e937ec16f5fab871137e6264bda35ba0851c7a3ee611bd03ae2. 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/QMDA72205901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38fbe18f974d7cb2b642aa33cea8c3a1413c0d90498e02cdb5313a06edde9d2. 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/QMDA62275952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912da6a5260fafbf57450557f9e674d8bdcbf3fc70f9f8b9227abf0adfa5c6f9. 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/QMDA62209367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b6002ce02d6efd1f36840c8bd9f028ca5181dc50e624fa00fee5907f148b50. 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/QMDA72205905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c36cada8c450a6b30964b7b2b77b64c685cd97edade2d60ccc8a9e52e8b7ec2. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/QMDA72205912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38fbe18f974d7cb2b642aa33cea8c3a1413c0d90498e02cdb5313a06edde9d2. 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/QMDA62275952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912da6a5260fafbf57450557f9e674d8bdcbf3fc70f9f8b9227abf0adfa5c6f9. 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/QMDA62209367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebda2ec54998e3cb7d37fc5e881ba135f95a10259d6b009bd62b65ff43ab5c1c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM6MZ2266924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb7bc2b86933cfde678ba495068768059c084bbf3f5b202d350adb435767045. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QM4TX2278978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656eb23056867dc82c42fa84b2ef2ed845cc02aac7771eb41296b73325f4784f. 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/QZK6F2144017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef5352792f777589dcc688247ccaede5f945153fc6907ad28fe16c2beaf4503. 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/QZFZ61959751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f16d2ef58a8b3bed4256dff16b2f875b8ca56865b6bb8b6b61c8d8c1e106fa1. 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/QZK6F2144018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7363c65efc83701fc59054b038142f532a03f8efa14c576e3760a27c507d45a8. 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/QZK6F2142490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf989af281e586f114354be0b9e3a0ba2856deeb70881615e399df4732f5ec65. 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/QZK6F2144019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886b8b31918b47cd596a6ba4240b6a11ee42572298f55fc2a3e226f74d0a2d02. 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/QZK6F2144020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7363c65efc83701fc59054b038142f532a03f8efa14c576e3760a27c507d45a8. 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/QZK6F2142490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21d7d262bb8e5531c9a56fd85dd29e99472062385d122eb3894f1ddc71103bf. 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/QZHNA1953288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef5352792f777589dcc688247ccaede5f945153fc6907ad28fe16c2beaf4503. 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/QZFZ61959751.