Barcelona is a city on the northeastern coast of Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second-most populous municipality of Spain. With a p
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 0xc5677200ccc451ad2c502cdde0ae5658cda4d54e4f8dbf4da40c144205d90278. 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/6804893a-2697-4681-902b-44ce209e04c4.json and https://artists.proofprofile.net/proofs/artist/6804893a-2697-4681-902b-44ce209e04c4.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 0x12681249e302cb25e77a1116045fc0340873ad099fdc3a36ff662271967d98b1. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:31:05Z), 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/USUM70957676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ac338bc534b6d0c9f71980679ac7878e84f6401ecb8904852c8ea25871cc7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USUM70957687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abaacb908d10b9bf9261eb907e87e6c655bdf12729734c24b95802679d9f4ea. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USUM70957688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ce501ef3387be3213732b6824b4e83f8292bb5797e8a885f617bc6643e3fc7. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USUM70957692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8549aaee62e8d479e3365c49bd951a39813f893912734feaea47b9d2b491c9c. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USUM70957694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5400951cf055a48eabbb5f9faaf11dc1eb5d11e869d6a96ff4134e120d0fe0. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/USUM70957803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3962e540912e0931e2ced0e0a8785c42727b771e75277fd5f90c22bf6b4a45ab. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T01:38:30Z), 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/USUM70957714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd9de45f09b7fcdda78cba8ad197561bc6064685739f23c6098f64f41829e2a. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/USUM70957804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafdafdfdd7965ff80fb15ae66e0fd64f518653f00d93f68b1ec7faca427eaef. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USUM70957805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689be6206d5fdfd25a359f992ae09a9e7b384e091344124f5610b155f8ef8a4. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/US5Z50900242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899ca3e2c2cf610a0912b57954ba9ae7b5282fd5f4ce8632c5ad9099e04e0974. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US5Z50900240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7a67f25e388d274aa8c35b446895a6a63fac71fe8b201ef2b8a0bc2f04eb02. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/US5Z50900243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0bb22e24d033e1296a34713f3fec5927d1b03d9db8d73b77619532bbc8a250. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:27:59Z), 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/TCABR1383835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67515107be4d398209283698e36f9077878d0f86f1c4a3f4bd611ccbb859cfb2. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:08:50Z), 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/TCABR1383839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2d6637ce6ff9b495074f964fe398c88a47a1b2be3a48b065ffd89a49586051. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCABR1383885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3e7358ed543210521839684e0761081595783239313d3d9ac65842f310cfc4. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/TCABR1383886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4334d21611ed043cc80aa1cf758042f8005a162c0652ca386958d5b7e84734. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCABR1383915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65f8b80af623682d280a98558f85943423c367548bbd7dfe69aa4b5da237592. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:52:34Z), 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/TCABR1383916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ce0ee5dd749b55d0b98911a5f915781b46cd5f4dfcdfde43b4b86035e24290. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCACR1668836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0636ff745e059bd9825bc468c4d262120de26d1f639fbe6253bf642003395a3. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCACR1668841.