El Gran Combo de Puerto Rico, commonly known as El Gran Combo, is a Puerto Rican salsa orchestra based in San Juan, Puerto Rico. El Gran Combo. 2012. Retrieved 3 September 2012. Celebrating its 50th
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 0x3a77ce500fb9673731ba4c504101a2239fbb2a5cbc7be81e5b0792387d25bcbc. 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/7b18c7e2-7690-4f65-b728-2b2e6c4f3abd.json and https://artists.proofprofile.net/proofs/artist/7b18c7e2-7690-4f65-b728-2b2e6c4f3abd.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 0x5396a881b204a6ab080eaf1689422fd7f33d08991385e388cd20767d6e19db90. 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/USMRE0804601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fa7efca0548c334aae52b4c1f33361292dd4cf12af646e774470a5b34258d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32365f17e2452f4f036a840f311fb803697b600fd9f27fa9fe2b882fdb416ea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38d34619209230aaea1d8bdfc1940c1924554f5a28eba3ac46960c7c1a1e639. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05644a44a8443d5bca0341eec3dab6855d7d0a78bbc12e042780e4f54560ecae. 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/USMRE0804608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ac96df08747138a7513c7603d23f54fc24a986131ad07266572ec7f78f4810. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10c68c729c83876fefcb6cfe1b708280eed05314875395df366255a1d821fb9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf197d22669492837f019b0da6cde394abc72edbd74b4689b376d822ce704501d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0803001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe716c227cea95825424ff3d91b7af48d688f8fed028fddcf843b9c2fc9354f5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0801306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb2a144dc93e85204301ec12bdac3bc45d042e83ba7888ba0755a2ef6394daf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0829001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8036e337d68974364bc07af59bd9edd9013aa7f1b2141a43b4b5433d7bbd9834. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0829003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8c34b75660414a7621712bab78e825a8c606e9e767700a1389ef9bd3950abe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0829010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554fa5dfc3c6646a5d9a1e6e16104bafa46e37bf81728c04afb8979af7403e9b. 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/USMRE0891028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272532b944a9467c96b81df963acf888ec8dd9086f12236baeb59306eaf4233d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0834002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74cfcc149b53304bb713d745ce1783e9aaa352564922bc5eceb273af7b98022. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0834003.
It's Christmas Time! (Original Recordings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ccf642a6dbf76de43768a0470ec42ffb983175516beda8be2a064365e207cf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3ea85d0526dbc681dacc14e96c7b690d7b55be156789a1b364c23f20949343. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10404333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1d0197b1268c7007ffc2c04fe35af6344e2d53642ace70d78f395b8b91f720. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0804502.
35th Anniversary- 35 Years Around the World
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040e389b6e29cb69929af4e4f457a9701ecb7ad3b5da881d0f8b2d9299d761bc. 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/USMRE0802520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd760c330944f06e57fa43e2e226d26391a8bc05c6b7a8db998ebe37d34280805. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0802523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc1328dfea1d2932928dd30d6e76e0f5df7d6943b45c33d82c7acc93a99b167. 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/USMRE0802524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e400e69a54b7b6aa834c0c347d51bd28a1695faa5c83a47d5b15926edf5fa6. 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/USMRE0802525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d9615c4d08048290d45cd5152d84b98b876339a59eb25a44ac7a014d4860f7. 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/USMRE0802527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa79fefe32cffed2f7fc835aee18c9871e316a0963653d5a9cc123a57ae2bac. 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/USMRE0802528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f64b40944b4264b80e92a70880c9fd8463e3a61248971997e03bce80f5ef0c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMRE0802511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6e18f6ebddf9e308a71d95f0f1a831665731132b391d2e8fcc8510ff5fa19b. 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/USMRE0802512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58abc865c80fdce40a303ad89943f3ad16b1f5d6353887383b6e59b987eef0cd. 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/USMRE0802513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3121697c7690feccc18d0050a554b9702e3694db99ffabeded0170987a8b10db. 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/USMRE0802516.