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 0x29f02064b01ca2557e4d04cd42614c2594fdd37d1958203ff7972dd71e05fe4f. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c29f4c5-c9b1-465c-97fc-9c7f44c40e62.json and https://artists.proofprofile.net/proofs/artist/8c29f4c5-c9b1-465c-97fc-9c7f44c40e62.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 0x55a0db5fbef824fd973c82d6db281d54479138c81c4e63095bff2bcbff93c044. 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/VED049200919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cc4cb26d780fdfc282167ba2c48585fcf157fa56a5ef0c607fa94bc6cbeb8e. 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/UYA130400228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94a0fc68afa2d5c5a7be866f32d0db56a1bfc2eda1a08278b35caf9ec23c55a. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/GBMA21873499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4903c8e880229706c76802b0cc27172f8a6a03b142ec2e608619ab7a25dcfab8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBMA21873490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9f89c1f72c73da534a112d18e8d0e07cb384a60112ddd9160eecc5c71edfc0. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GBMA21873492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb03bdeff8ecefd6cdd6ab79eb83d5a38fe02f6aae1f95510b37e4027d4d2b61. 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/GBMA21873496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94a0fc68afa2d5c5a7be866f32d0db56a1bfc2eda1a08278b35caf9ec23c55a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBMA21873499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab21fee2b18a86274dac3ebdeec0c6d1b4f2f7772931dbe76950f53e4c5a9e4. 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/GBMA21873488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4903c8e880229706c76802b0cc27172f8a6a03b142ec2e608619ab7a25dcfab8. 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/GBMA21873490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9f89c1f72c73da534a112d18e8d0e07cb384a60112ddd9160eecc5c71edfc0. 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/GBMA21873492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb03bdeff8ecefd6cdd6ab79eb83d5a38fe02f6aae1f95510b37e4027d4d2b61. 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/GBMA21873496.
20 Grandes Exitos: El Cuarteto y Quinteto Contrapunto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9c8aa28d22e69270d0e214c0e44da57147df6905bffc06de9be9ae7744ecd4. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ARKVF2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6c389291fa016cec8eeda0acc29505ec47677d92b9bbfa89e148c73f9b4875. 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/UYM121103151.
Diferencia Sobre Guardame las Vacas / Polo del Mariscal - En Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25519c25bda6040a7ccf14ee41a1c09cf3a4f38638b0e33104c41917e53865b0. 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/VED049600274.