The Guadalquivir (, also , ,"Guadalquivir" (US) and ) is the fifth-longest river in the Iberian Peninsula and the second-longest river with its entire length in Spain. The Guadalquivir is the only ma
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 0x42cd885b89aa2daa40d9964b939938aa3cfb2366768aea3bb5313c82cff2bd8e. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/885fb129-8ea1-4628-adf1-de93347ec201.json and https://artists.proofprofile.net/proofs/artist/885fb129-8ea1-4628-adf1-de93347ec201.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 0xa0206fb80195fe17fc6cfb817e17a39a1d0a21602d92ad737c76040b9c05f9cd. 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/ES5088000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14325111a47013ceae1e368cc26de33562402a800371efa7dc63e4c8b97a1a22. 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/ES5088000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50af34f996f00827c0bb8206d1876c6fc0db4e54268de0d65fc46b9d0f08d485. 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/ES5088000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad117a41d301b50b60fa9372e485ac18817beaac57626077b57d63ba5f506f39. 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/ES5088300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504e235ef2e16698f6b90f7ab1d3cd933c83321bffb16535155276167e80b0c1. 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/ES5088300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adcf807c978a9064133d3879d76e4e14bc6268d15f297f8ef08293e8ea54c11. 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/ES5010500185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adcf807c978a9064133d3879d76e4e14bc6268d15f297f8ef08293e8ea54c11. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5010500185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42615c4c5b30e750c1f72fbfdee13984ca040b71f7f1a31412675353a3099e50. 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/ES5080400626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c84eafbdb9c448b7cd5c39e03d4a83a0551163c96e8b0260d802e79673a613. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5078800082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616cd9d5c095864ad7b03c1bf4f94fe03a815efd81a4b4daab1bb3d56d493884. 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/ES5107800048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f807f340b416c7a85368461d1383ad8d73cd70cef72aa3832ce004fac041e1. 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/ES5119901771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504e235ef2e16698f6b90f7ab1d3cd933c83321bffb16535155276167e80b0c1. 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/ES5088300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18807203ffac519c5f22097801250eaa789b66f267f059cf1194e0becbf0c11e. 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/ES5070300169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa249ea49fd1961c189e9309d7494c3a9560193e41f29468e219945e5b17399. 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/ES5117900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd745c9d0afcb572f2e2a171192347ed68ea30337e37e73623ca8143e6dfada. 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/ES5079400356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b0ec46d52a71ef3d174caa51715854c5ecc472bf07371d3f307af48d03f7d2. 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/ES5350602164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9dc13c83440418439555e6a58a6c05361cbd47586366ca6d924a7cb28419d6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5350702271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f0b533a611dbbd7c3a840cf4ad9ecea82e7ed41fa470ac9248a1328c08c0c4. 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/ES5351002759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dac02670f1fecd0a68bd7d668eac264dedb052ae935b0182dfa84243bfe83a6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5351002760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c478b2e67bb7eda4690764a542f2823236fed41a0f08e3fb04f3cd132ce10a9. 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/ES5350702269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c2a9933834b0d5e55e4d45f3b449a36e2e8f42f2a535371db52c0c9ae280b7. 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/ES5351002751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f43740df8250ed078b21449e74883a2930d3adfbf43bd443b4e3b570d3aaf5. 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/ES5359600867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957a7a97303cbf2dd43f5eff4134db99d88c13c84ef14f3302e6bcd8aa8464bc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5351002752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbcf258f1fd0cdb91efb92e5cea93b71aadd45628a5e7fba4df8be7f62454e7. 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/ES5351002753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fba50d708329d79d19cfac26387bf4ec497c89ffae83d2af1959ecef859497. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5359500423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cf624843cd440959da0a452dfa3f1a6c2335577da8873b8ae9466f0b1aebc8. 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/ES5351002767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3213f78ca777c420e659af706a5b382cbba1a74eef5de31d430b776f765b11bc. 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/ES5359500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fc3623110694d1bca37f2033c7663f85fdf707899dbae7d500c00d53099874. 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/ES5350702641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096e32a39fb193861d6f87174b71f58aa56a178744800f8abdeedf1c150c7002. 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/ES5351002770.