Skansen (; "the Sconce") is the oldest open-air museum and zoo in Sweden located on the island Djurgården in Stockholm, Sweden. It was opened on 11 October 1891 by Artur Hazelius (1833–1901) to show t
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 0x0aecd6eaaee0450846837db8f758c3404a6a415d03cf1394e58e2ff09c5255ea. 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/edd8e2fa-03c6-4af0-873d-01a128731eac.json and https://artists.proofprofile.net/proofs/artist/edd8e2fa-03c6-4af0-873d-01a128731eac.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 0xd5bc4c78fd8d33851b7dc01d31244d422b1aa9ebaf83242bd70ce58f54a9f5fc. 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/QZHNA2354725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b29632a4dd6b19602a069bd649d77e1fd3003e26d54f269d67ef8970f279e0. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZWFN2324979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7c2d4877976dc0b1cbdae99c1c4bc0bf47d1ba8bcd892b3c6fbc4a1e0c048a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN32434104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceca20b98b7f23683d3860edcf1dfd8c237a01004220449d12459c4ae97bd522. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USA2P2420299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc3e7e8b9e336ba4648c11688d3d9af64f3417fa52d20668885d448f4befcce. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USA2P2420300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec8cc022f434f94c63f8e473972e5b8d454e1c1a2ff50c6ad14ef1c9c7d4b0c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2420301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a559826b0bebb0d58e08b6517b7210183994a8d6d3809e6ce04a65e5d79688c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFF2446307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452cc15164c13f61604af2b51bab65156e75e3550e3c963c053a900dfb1c978b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USA2P2517033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa988091028b0d28be78966bae18dd2273ea5f5dda521982dc5e5ee1b887d0755. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USA2P2517034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a0b745e234bf3e3e5ff6a130b7863277666d13477f143d856094706afe93f7. 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/QZHN92459283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c89a2a352bd0d856af2f1d5d0532e5efd9c56ea323ad5a12f870162dfc99f1. 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/QZTB32314610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f8fc88b7c310f397a719f8ef054c9d421f3b73d8568f2034731870d87aada5. 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/USA2P2468111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146279dc2f2dc75cb8b9f94d073c5d5f618d59ff74b8892d47353b615048b0cc. 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/QZTBD2428064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb66f53805979097248b289a137dc15ab3e8a98dbd7fd37212bb6a5b51954b22. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZK6N2450662.