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 0xbaca7175d294d20b989274debda15b88997fb2224514bf4caca2ce8172795d5d. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f15a81ed-931c-4c35-80bc-6e3e796f6b71.json and https://artists.proofprofile.net/proofs/artist/f15a81ed-931c-4c35-80bc-6e3e796f6b71.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 0xd781fe57fa202db8982a288d64c8ea85f6676cb683bbecddbcd6578ab57e504a. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEGB91800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f810f06f3fa859206117e206bcc6395f3f14e1e404b9520fe21bea55c88250. 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/DEGB91400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e1ba11ce48bdc5bb67f8d6c95babb7f18c7c5cfa37b8a8f533874352f9dd88. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEGB91700104.
Kinderlieder für alle! 35 Lieder zum Mitsingen (LIEDERPROJEKT)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef181f7279fc07495867f31c9725a0d30e95ddb064e92e883cb7ccd7bf6706f. 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/DEB111605701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10505241f1ae35f01bd7d6481fbe6d15f59774a46ed5144b7bd365c8ed118503. 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/DEB111605702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf687774f34123c31e1be50e3596c2cb7b14f728f320692ff1347b17bca365949. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEB111605703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c4dced1f9cbbdd4f21d4d910b54614ad81362e3b7943d060e81509488906fb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEB111605708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0c3e8613aff5c648e0ee413dd2ade433d9946b7e9f6d603c4043eac5b37666. 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/DEB111605710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41148dee6609fdd4975ad0085358a3c123fc1b9ab1fe47e76e86be12950fa035. 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/DEB111605712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4251b6445d0c456b50b2e48de8127270069fae9f2fc57b6018b89bd0e34b69. 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/DEB111605713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe875575a1a43fbacf42b6be1b09e6c237a166f4b75e75fc8efbdbd313c461a5a. 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/DEB111605715.
Pera stus pera kampus / Da drüben auf dem Felde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea2485f078833dfb3e7f35e3e37b72b07561fda23907abe38dcc1ca1e31b0b9. 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/DEB111605717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbb071054b8cdf52245481a899f1e53bbb6e0cd8235cf065f8365794df1de39. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEB111605719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ef30c016d4103a77edff07b0ee92cd725042fffe83704cb2c8e89905b47da0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEB111605723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0e52ca70bc395c3a4924fedd49b2d79aa272bb135aecbde386e32fd0fe9130. 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/DEB111605729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdbcf14b70cc807e75ded03e58f8168286034deb2d00497e6b5a56b990aa95c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEB111605735.