thumb|upright|1880 first edition title page Heidi ( , ) is a work of children's fiction published between 1880 and 1881 by Swiss author Johanna Spyri, originally published in two parts as Heidi: Her
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 0x0940576c5fda28700ffdc0e4a62ee00d04171b8d946293873ff7b92820f3674f. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8767848-37e3-4e98-90f1-a75b201fb2c6.json and https://artists.proofprofile.net/proofs/artist/e8767848-37e3-4e98-90f1-a75b201fb2c6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5416976a63a92280ad47ba4fd7e91ebd7a9df5e34dbe4dbe840ebe64ae5f043. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NLG620486119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d3f652011b2e50be5cb2860092656566edd244aa5d46077e10ba3c2d71068a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NLG620486126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd3291ee559581607fcbcb4d69333a79e6426f85a4d5a2d1fcf4475c3c7639c. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:32:40Z), 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/NLG620486127.
Heidi wird erwachsen, Folge 1: Als der Alm-Öhi stirbt
Heidi wird erwachsen, Folge 2: Gefährliches Frankfurt
Heidi wird erwachsen, Folge 3: Auf der Flucht
Heidi wird erwachsen, Folge 4: Das Unglück
Heidi wird erwachsen, Folge 5: Ein schlimmer Verdacht
Heidi wird erwachsen, Folge 6: Zerbricht eine Freundschaft?
Folge 1: Heidi kommt zum Alm-Öhi (Schwizer Dütsch)
Folge 2: Die große Enttäuschung (Schwizer Dütsch)
Folge 3: Eine schwierige Freundschaft (Schwizer Dütsch)
Folge 4: Sehnsucht, Spuk und Tränen (Schwizer Dütsch)
Folge 5: Heimkehr auf die Alm (Schwizer Dütsch)
Folge 6: Die wunderbare Heilung (Schwizer Dütsch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3842e83a52c29f6cc96eb00b3ce7394ee4873820847c764e232c0615c4c78e0. 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/NLW2R2150512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11787d8081dee2da1326c65c5d868475b3137e6c88af74b978dc6e49958a5d4f. 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/DEKB72056271.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cca31c30df6f34f3e7dabdfaada4c2b767807570a09b3ef5c1fa5cab75caa1d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:45:25Z), 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/NLA349500026.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a33f9ba3cfb7f788ec4cfcdde3a8d34a22a212796a7016932999f83d304b373. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLA349700167.
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