Polyphonic Size is a Belgian new wave band founded in 1979 in Brussels by Roger-Marc Vande Voorde. Mixing electric guitars and synthesizers with French and English lyrics (and sometimes German or Jap
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 0x6181003d5ccc408a4fada226a2916eb3cb6eb3d3c319a06e60bc529120844aea. 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/eb8f26d1-9fd5-43f1-9ea0-ae5b4346a951.json and https://artists.proofprofile.net/proofs/artist/eb8f26d1-9fd5-43f1-9ea0-ae5b4346a951.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 0xd2a8c4e12c5b27b866dd12bca6d139772f1a67fd5b4feda3a443af05c626699d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QMDA61484717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b9f08ca1e5789fdc73a72534ba13ef84f2d10dbffa8cc678977df135730d5a. 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/QMDA61484719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51a1b97285681256a30d3c08df7504088d64dd8895704974cd0562cbca6d1d6. 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/QMDA61484723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5212e8e88268e696ca7ea5cdafc20088213d9edfafb3f60a89ad7412ee98868. 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/QMDA61484724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81f98cd785a17a649cd46b26ad6d9c0f5cf58250b3843346d30fe9c48c7eb84. 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/BEP010590006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e022a4f9f0a377264ba6c022b0673fd15cf31d5c2e1e0c8fdb062125255cb4d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BEP010590007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abf4f558aff1f5c25674b6e3f40d05a80e5306df0dbc8cb914c216c1016238a. 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/BEP010590010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5e9ebb5e94e71975c22ceef727d74f65d0848e4ac3f94a5a54d4dc40504b68. 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/BEP010590012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a876564609125c6be69d5e02d2c7127da66b71c4f6ab2c02dffc0928a38b544. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BEP010590014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02891a3f74dcbd79ecffff49cec008d588a2885447212a0309e6ccbf27c953a5. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BEP010590015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637ec8c2dc4e666cecfe29f308c5d984b9b796803dfccfe52d6043646d452543. 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/GBYFG1100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4598bf4963679e91b1d9583195ebea1c8132263cd18e63105473a1601cdf756. 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/GBLAZ1600974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3e9ac7153ba309307b25dbc08697cef97e74868d41d1c74b78510eae226776. 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/GBAJH0402424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03117891f969c90dee1d832ea86b0a51eca1b7bb6836bda21317be7038cef62a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BEP010490842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392c654ac3e596cf3283805a4262920b1d0f2f262316517efa8f6a5adbf11a74. 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/BEQ221175757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212de48330efdb14f5442cf131a338ef833c9b37d9200cd8e9da87e7797b87a8. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BEP010490672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6898780b8d794e11d778905f2b2205e74c57de31e6eb388da324d276c9b63818. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBHQZ8700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd432d5155efb4b9e5638f69b46ec68533109b3a5f9e853ad196c1768e7ae7c87. 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/BEP011950003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf1d16fb8e041325222a836a6cd0f5c6f3860926192d12982a41e8ad101d10c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BEP010491222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fb70b0ed6e3c30029cc083162e7e5bf823a3ecde3232ec4749f58cdd10bb5c. 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/BEP011950002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598bc7f53ee94255809fd7800140f899070b4c34ab2bc146386e8134483e6aef. 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/GBAJH0400638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a32daabfef5360d56b70a91b5cdb9f65bb63e2c8b34bb8f1b464e538de8ee01. 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/BEP011800012.