Loons (North American English) or divers (British / Irish English) are a group of aquatic birds found in much of North America and northern Eurasia. All living species of loons are members of the genu
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 0x0c934b438a96cb09265a4af409f8b4dac3a27fb7638f2daf5dd81804d753510c. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90074557-ce57-4239-8b89-b61ca93d011d.json and https://artists.proofprofile.net/proofs/artist/90074557-ce57-4239-8b89-b61ca93d011d.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 0x467d34a52b27c1d29ce175ba3f76279afeab01b1dacc61dab597fee2b0cc6077. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NL8RL2462540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9057357ed26ff5f4aa39559dfa92fb2ce45aab24e748ade27f231899e0fc9589. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NL8RL2460344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0669a1a86ed7708e42a9bd093448172f319ef1ab7cc85c27e13e8ecbf5213394. 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/NL8RL2501783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf889984fa3791df385aa1dc939f4266cff6bf9c8fb02b5fbe6f6367050e2e4a7. 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/NL8RL2501784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aff938b6d2014dd55ad19ba9b3df83287f14756207351d94ad2bc47279f6287. 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/NL8RL2501786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb119dbfefcd78bc19e9c01bd1d21ad04e83d434105c8c43da1a3c0d8f9e612. 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/NL8RL2501787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f85060168984654b573d77c0430711fa004eeb49f0a5f6e86f30bd054115011. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NL8RL2501789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021ec8297abe2a3d01f5a92402f6496e2c12e2793651c300742fc7b4df93f98e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NL8RL2501791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467d34a52b27c1d29ce175ba3f76279afeab01b1dacc61dab597fee2b0cc6077. 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/NL8RL2462540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463537135aa3d0a21961187e5c08fe76180974c8251e9b3c5a801857b90ee2ce. 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/GX8LD2398150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340e05082ac95f0a8eb4443e3a0c975edb9a0edee63ca9719222cb8ec7acbaa8. 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/GX8LD2333076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71256297dc846da1b6d1abeecc9605c291ec97af9d922fb75bec5af98e1b021. 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/GX8LD2374789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42efc855a9bb897995984ebd83f0219818c88bb864565e42474a6b77f8a00d54. 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/GX8LD2389972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c76dbe6069bc3cfda2811c384ff6c86801167ffd54b175111e711fa060d934b. 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/GX8LD2375510.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd65c185f41cd7c8819af8762da0cc1a04a652df453aa7a91be4917fd051e5e. 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/GX8LD2317173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0eb7a9e0d86d39cd5fb178b251149f247a0e9d0dbfd416f8e9897e1d460a38e. 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/GX8LD2328894.