thumb|Image of Jacno Jacno (3 July 1957 in Paris – 6 November 2009) was a French musician. Born as Denis Quilliard, he was a founding member of the first French punk band The Stinky Toys. In the earl
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 0xed53a2c015cb19becdafe37352ec31495ece545c7ed0b49e19deea0be46112ed. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f51ca05-850f-40ff-9fa0-ca0852724ee8.json and https://artists.proofprofile.net/proofs/artist/3f51ca05-850f-40ff-9fa0-ca0852724ee8.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 0x5aff5d785f9dd665cc7a65206c582bdc11cee1e7de07a7fe5a1b43c083646666. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FRZ040600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5127da49791fb492ee5600f1c5e4910a3746cf529cb3c75f2940a87c22c940. 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/FRZ040600002.
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 0x16cff04d49df5c7838bcd589da3c9198eae6e5012c8d53870a0a4e828325967f. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/FRZ040600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe363394765c68f66fac254643fead59f4b064c9ed900a5c448a32de5db16280c. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FRZ040600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3a1737f4343b118ae4b1c762c2c27f6c3c962d24934dd036a918a2cf2f302c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRZ040600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa892a16bb071a8f7a40ada3b8317d755dfa2da4d01181b4d4f5634b7f86ed2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRZ040600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176b8687afeb8b3ff06db120c3e1bcf1a367a243f5773b05256f735f0c0acceb. 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/GBHCD1150913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e825fbf16171a009a93ffbae52b4908ff85781e01b76e92c037c1c515b31cbd. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBHCD1150917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acb1ecd00e93c3de4b3f86e2ea39dadaea11c02f19b5a9075057befb8f702e3. 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/GBHCD1150918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadef886f13ecdfe15f2e0c954574e5a07ed4e6f57e5e3df2e1a2ba51c77088e4. 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/GBHCD1150922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43095402924c5967a8858c2bcc07ec78c8a11b26d8a6f29a01900631a3c634a5. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBHCD1150914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bcd541be0257e12e92b21ac3cb5badadfc0082a700d466849cd0b4d0418678. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBHCD1150915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72882f5fc8e3681e7c8b4dce5389c493807064cb3bfca6acb7b1435dfb0f223. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBHCD1150916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe057842bd9d21fd23cb7f1155883e6e5b787914503931959ee891793639d727f. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBHCD1150920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc37e3a5c5e6d5d35aa797d0b2137f31cea5a3a661ccd3ea81da3ef172702daa. 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/GBHCD1150921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3c20791e683d3a4e84499390cfef4599a4c6fc4ee706a8529d90821c27f83e. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/GBHCD1150065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f4275a2742ec770b083864b4199ea92eee6bbfed12ed0ece4176f4b22e8635. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:53:27Z), 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/GBHCD1150066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4c00a63d498c99e1faae234409f7881da5b382ec7177d069c8daa7368d02de. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBHCD1150551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21e29c8e96ad60ec8e10373af9b17aac525315b9a67057cde5b804277d2313d. 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/GBHCD1150552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190022153ab19416762d3bf7e0619d5719983ff77cce225de0045d3a51226197. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBHCD1150553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cc5fb96fca349cf265e9a2b79028f311284497be5440788a008f3b9c5609d8. 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/GBHCD1150554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa428023ff9659e3586375fea447a61dd02fd07fccd9c74e8151f89700c374129. 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/GBHCD1150555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00744ad7ca2e5d5fb18ca64c34d45eb4465dc0ab98d37000446d1472ef5212ff. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBHCD1150556.