thumb|upright|Frontispiece of the 1595 Atlas of Mercator An atlas is a collection of maps; it is typically a bundle of maps of Earth or of a continent or region of Earth. Advances in astronomy have a
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 0x36334e723540f917e148156d34ea01667d0cac4189fd8527aba157a340e43e4a. 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/133cf421-caad-4810-98ee-ef7e5e548435.json and https://artists.proofprofile.net/proofs/artist/133cf421-caad-4810-98ee-ef7e5e548435.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 0xd7156f3648888853804d4e108d92d1bfb675e56be1bef70358f3071a8efcc0b2. 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/DEA452103390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfa706989f68c94da33ef5a0747242ac4f49ab4b5a1ab568cc5d4bfc580d623. 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/DEA452103400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293f9ffb6b122c091a8d5814b48db3e90c86903595cbad1c954c05780cc5bbeb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEA452102170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209388e17b0c057531a03811c7b8158d0c39b35532231de035d3f2ca27078537. 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/DEA452103410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be10d6e0ad750b8a3bea394eb6bb5c85dbc264707e235082b944f87ed2c2fdb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEA452103080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5147f19f1da27d14e41eaa822d8a003dad95c5505b42f5ef3918f8d0e3b9eb. 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/DEA452103420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521eb7b83688ed57d83c0fc9c3f76c87e80dd159a991e3c8bc6c72b707fbed5a. 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/DEA452103430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203c2ef91338f57a8030098a6ad0a70c489e27b5c6bd3b9e4e567a15c25afedc. 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/DEA452103440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcefb3aeb52d8d3c0951222654360047ec21ba97ac5411f5a58bbe3d4a6591f. 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/DEA452103450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1b718567347386557250668509ed5bdc7cb2993babab4f77308a5e0796125a. 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/DEA452103460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe410ad9dede881a704ee158d01cd37331c575f13a464fed8ad2cd0a0ddacb99f. 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/DEA452103470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2fb98c3d26e0def62040a81042a7cdc144ce618cb0815051c097a7bd8c24d5. 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/FIATZ1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25bd2f63fa3f2275affec91fb805c3b468a9bb2d396c9fe6546f48601cc46cb. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FIATZ1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8ce4cd8c7a3007a9b94b2175a20e127bd3c4ebbddd62749a5fa1549f2474bb. 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/FIATZ1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f16878e9f8131ea66175df157eb55ee6b2df12f8e0eed7c679572039fbc3e6. 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/FIATZ1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f7996e0d382ce8e58f9e925d9fd5ee057d1447777e5e3d6fed25fd18ccbac8. 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/FIATZ1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9ddc915695e8c212e25043639388d889d1bef5f3ad29b94a3658c037162c13. 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/FIATZ1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb53a92dd966d0dafb24861bba5b6169efa2096e1a077fbaae97c1c6b0340e3a. 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/FIATZ1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0f17b64a1983c30cb50d2b48f14781f50a4b09e299d63677e6b1b91d7d3056. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/FIATZ1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8e89fbcd3e9996a408508c3de27fbf83892287c4e99487a0ec680128fdd6b0. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/FIATZ1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1b718567347386557250668509ed5bdc7cb2993babab4f77308a5e0796125a. 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/DEA452103460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6667335faef8c6bfd279007f243ed8960cad50ed426a62434795358dba856c48. 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/DEA452104210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be10d6e0ad750b8a3bea394eb6bb5c85dbc264707e235082b944f87ed2c2fdb. 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/DEA452103080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293f9ffb6b122c091a8d5814b48db3e90c86903595cbad1c954c05780cc5bbeb. 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/DEA452102170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6667335faef8c6bfd279007f243ed8960cad50ed426a62434795358dba856c48. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEA452104210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293f9ffb6b122c091a8d5814b48db3e90c86903595cbad1c954c05780cc5bbeb. 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/DEA452102170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887ecdf9be6564cb072628996b28286b414923b48794aa07d9f59fbfe28608b2. 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/DEA451903500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385b2607f6a250b654de02046274260e4eb59cd546ce1e905700f911b27da28d. 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/DEA451903490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50a0e518c75d8fad2a271047a6cafdedc6b2fd7abb103af511198fe01d85cb8. 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/DEA451903480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1874fcd6c70e17bda9129266faddebea1e758ab97c36788ceecb6c71ec18e8d1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FI3FC1894001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6cb545198f89b391b77d85ae1fb3aa5a702c0bd6fad268f4852c53562c57ee. 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/FI3FC1895601.