thumb|Tatwaffe (left) and Def Benski Obiwahn in 2005 Die Firma is a German hip hop group formed in Cologne in 1996. It consists of Tatwaffe (Alexander Trabhoven), Def Benski Obiwahn (Ben Hartung), an
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 0x3abd4a988648c607f6cd2d39e0f59389d5108a485eba3c350426b8f274c748c1. 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/74446dab-d52e-4465-a29e-ee8939dd2556.json and https://artists.proofprofile.net/proofs/artist/74446dab-d52e-4465-a29e-ee8939dd2556.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 0x03338bd6549443630a854141c37c6e8eaa115db6a076c22843ddbcabcf0a9a56. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEAS31100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d08db503d62988b038fb742def49789ce05d323f1bdaf21b379f3d07552012. 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/DEAS31100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc6eff480b549c733bc3868b3e16615d9acedfc11b40fe3d90acad6b1c209c9. 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/DEAS31100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448214c6b5babf13716a16cf03b03b35d83127db031580a783bae020194a7882. 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/DEAS31100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63006f8f3bb6eebbfa60a1f25b721d6d3c1201768eb3c50a4e0e0a1623240c7b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEAS31100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbce6da33856f3dc8d81aa13d5f274e2ec411a94569af7f99f3207f3a84486b. 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/DEAS31100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa401151277db4414a9339593d30e9cdb21bf28b10561cebe4eac8a5aabcd5cb0. 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/DEAS31100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca4775c4707146c6ae26eb3ea1b79890fa21eee5a2fc50f4691176ad46741bd. 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/DEAS31100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ef3908f2a5e374e5ccbd3947e17817806fed24836d727eba297b16dd3a48a1. 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/DEAS31100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5234fc7c9c263eec3ff487c3428ebb9c37de25e8c7239ddf1564c6a6acaf1e7a. 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/DEAS31100038.
Spiel des Lebens / Spiel des Todes (Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d186c0fe06b918882db9c17d35bd893c64600e82f168b87fa2bcf64cadd836. 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/DEAS39800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc52e364e03090112ad6f2f05b08ddc6c6b3d0a355fb63efbc66fd4018837b13. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEAS39800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7150ef220717e3844cd43f15b44fd51e071a170d5b6ce5b2826201052db6674f. 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/DEAS39800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891bbe9aef98a1cb46d7262cad36a093918a36bb2c682293ac40089ef4de261c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEAS39800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3323fd3828a317643384be5d92e40710024e4a3d5900861eac7a7199430c8b9. 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/DEAS39800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea4c489ba8bc4de06caff420d99ec3f7f6557d1af6118510ea55d80d6e2829b. 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/DEAS39800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4007c7fe19f7d68db51a979ca98ee23227d21fa8987bb086ebea1a3e9a729bf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEAS39800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6961db007c2262d599e2fda122b780fc009f7a9b1dd02f87c23d244c35b8d10d. 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/DEAS39800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b3a221940cde23851fd32d8ec7f9f1332669ce455ad40e775aa866aeaf14c6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEAS39800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d92bbc25aa1e41bdcc96481cd8c2acbb851fd8231bb32e3bcc3ac17192bb576. 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/DEAS39800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7baabbb6ec1a217398fedb426620577edcc2e2a8a9d1ae0b80031cde25f1a75. 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/DEAS39800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d75fedf6361f4959ddf7bb945eaf74c18cbe01c798cf713b75a2cd43a6c829. 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/DEZ040701146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1717e3f74ceae501801461757e5aa77c9c7636ba688cada3d37dc39dc6aaade9. 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/DEAS31100006.