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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17e81aadcd5d03771bc8f080851f26f70dd8c6efb58167e763c5f2efdc18114. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65c83f3e-40c2-4999-a605-0af29340c5a8.json and https://artists.proofprofile.net/proofs/artist/65c83f3e-40c2-4999-a605-0af29340c5a8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Great tit, wood pigeon, cuckoo, great crested grebe, trzciniak, the crow, chaffinch, crane - Tuchola Forest - National Park
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30243c5a2587ba164d8bcbc65ebe75e2e70ae8c7b28bb719cfbdfcf862c8e1fb. 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/PLA800465301.
Finch, cap, cuckoo, diapers, potros, gray nightingale, gull, trzciniak, sparrow, chaffinch - Drużno Lake Nature Reserve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb989f06480f10baa7e8800a20dc4954cdfb1c3e23db1b5389e81d7bb2056ea2e. 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/PLA800465307.
Great tit, great spotted woodpecker, ringdove, great crested grebe, primrose, gull, wood warbler, trzciniak, chaffinch - Tuchola Forest - National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3a12c487f339e122680e3076125e87dba7d30d2d9715f19b7276a5b38c8b93. 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/PLA800465302.
Grey heron, finch, cuckoo, willow warbler, collared dove, grey nightingale, bunting, sparrow, chaffinch, rooster, cow - Drużno Lake Nature Reserve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79df6233d955e04c8653141bfc355310e74d18d58f0f73404937d3da5b5d82b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PLA800465308.
Great tit, black grouse, cap, blackbird, snipe, a cuckoo, fieldfare, collared dove, Wren, bunting, the crow, chaffinch, crane - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640cb357726db5c45f672b6115e34918112e3ab1b7add7ae90821a425af52c0b. 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/PLA800465316.
Great tit, cap, fieldfare, collared dove, Wren, singer, bunting, the crow, chaffinch, crane - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc661e59484a604c21ff7a53bae452cd4926520fade44b9f8c918948f2371051. 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/PLA800465317.
Grouse, cock, spotted crake, common snipe, fieldfare, bluethroat, singer, bunting - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8496e87544ebdd6170a5107505e836c347bb2216ff6ba8268459708f4ce0a2ab. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/PLA800465314.
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
White stork, black grouse, blackbird, spotted crake, common snipe, cuckoo, fieldfare, wren, bunting - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fb32697dd1681a717ce8acf195fbb067f4b067b48a548d09d450bbdfb1972b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLA800465315.
Great tit, ringdove, cap, great crested grebe, primrose, redstart, wood warbler, trzciniak, chaffinch, zniczek - Tuchola Forest - National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d32fbfbdab89a63ed8e06b4c50ef04b54a3e75243080dacf66f5522208c52e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLA800465304.
Great tit, lesser whitethroat, black woodpecker, great spotted woodpecker, finch, greenfinch, cap, black redstart, blackbird, cuckoo, martin, willow warbler, gray wagtail, reed bunting, colla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f88801f15b24cfdadf7ae4ad44f4125da62fbd37f4beb9cb030f807ab680ad. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/PLA800465310.
Great tit, ringdove, cap, a cuckoo, the copper, great crested grebe, primrose, redstart, collared dove, gull, wood warbler, trzciniak, the crow, chaffinch, zniczek, crane - Tuchola Forest - N
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4930bb3d1936457330d5525bb836a6828e012f2437ed5dc551360f124db56459. 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/PLA800465305.
Great tit, great spotted woodpecker, finch, cap, blackbird, cuckoo, martin, willow warbler, gray wagtail, reed bunting, nightingale, gray jay, goldfinch, gull, reed buntings, sparrows, whippe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17188ed5935d829a60f648e4889a8c36beca151d8f32dace67f972f4434d1335. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/PLA800465311.
White stork, great tit, black grouse, black woodpecker, cap, jackdaw, blackbird, cuckoo, fieldfare, collared dove, wren, starling, yellowhammer, the crow, chaffinch, crane - Biebrza National
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e8a7368e00674779777b02f1ac0ced5680039c485e7550e9d2f66f6857a567. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/PLA800465318.
Grey heron, cap, blackbird, swans (whistling wings), willow warbler, gray wagtail, reed bunting, gray nightingale, goldfinch, reed, buntings, sparrows, rooster, dog, cow, frog - Drużno Lake N
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4a7eec9cd122bfec1f1c35f3e84c835b938c415df763abe60d081b1d889902. 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/PLA800465312.
Black grouse, ringdove, cap, fieldfare, the copper, collared dove, wren, starling, singer, buntings, crow, sparrow, chaffinch, crane - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b16ba77977289bb9cf76bea49a293a6ff5ab30c9dd0718adf445abb3e21fb11. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLA800465319.
Great tit, warbler, linnet, cap, cuckoo, willow warbler, reed bunting, gray nghtingale, gull, buntings, sparrow, chaffinch, rooster, cow, frog - Drużno Lake Nature Reserve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729e2e59100d1afe81c3e2c25b8cd93abe1a5adf2ba1ad08eb0fd81bdf63aab6. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/PLA800465313.
Great tit, cap, blackbird, snipe, a cuckoo, willow warbler, primrose, robin, chaffinch, crane - Biebrza National Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f1530f59bb38b1a88ed62c75fba96a9a633b2c011a9349d20e2e855a44c848. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/PLA800465320.