thumb|Buitrago c. 1943 Guillermo de Jesús Buitrago Henríquez, known as Guillermo Buitrago (1 April 1920, in Ciénaga – 19 April 1949) was a Colombian composer and songwriter of vallenato music. He is o
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 0x56c22964e87124a21a50aa669deba1777088cc168aa6f5325001b7b689002e77. 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/29cdb209-8e4d-4d24-af3a-42a120ffc949.json and https://artists.proofprofile.net/proofs/artist/29cdb209-8e4d-4d24-af3a-42a120ffc949.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Antología Musical de Guillermo Buitrago (Éxitos Originales)
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 0x3886375c18936e0fc1b726d4892396765311f2db6537b4c115dee158b61a4bbe. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/COF019401296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0a2dc5a52a2945d5ae473c6aa60fdd97ed5fdd624444a47498bb836871da71. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COF019401299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e460febeff1a0a9c3cdfda76b83090369da8cbbb711f62acd73e812000a6cf. 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/COF019401297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64c297a6bdc94464a81df2295bd581d9f42269cba1ddca701a80feb1603dd0b. 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/COF019401291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dc5a45c55be802e682dfbfac066406be7ffa0592243702f942f079b7f1f4f2. 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/COF019401571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903a75893f9fd08e321d17f3ec771030749d4d8bfc1b7f3a9b29d5cc873ecf1d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/COF019401295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7387ef75e4feabbaa4b33b958425066a5cfc058b8f94983d4574b3ac7f444b8. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/COF019401300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3886375c18936e0fc1b726d4892396765311f2db6537b4c115dee158b61a4bbe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/COF019401296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e460febeff1a0a9c3cdfda76b83090369da8cbbb711f62acd73e812000a6cf. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/COF019401297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64c297a6bdc94464a81df2295bd581d9f42269cba1ddca701a80feb1603dd0b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/COF019401291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c6add0bfa561fcdab4101b686dbd8d8d0a454df6f3f24ffb1f70c8bc1aaa56. 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/COF019401292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e460febeff1a0a9c3cdfda76b83090369da8cbbb711f62acd73e812000a6cf. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/COF019401297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6740309ead034d3f53840e5c66b6c9a9b029a098ee5baface4e5d95b4ac07f8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/COF019804857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c98864a97601a87c12d4ab12525fd48ad371b47f4fbb4f8e21b1620f4f972a3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COF019401290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe262785435bde0a80e47f84edb74d2997b82673ca3a7b0153fced90e096b4eaa. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/COF019401298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6771217a7182a179246517f4049dd8ce4dfbe4b697b476b05a6a95b91c322dd8. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/COF019401539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefab7be9f3901473dda9ad6151bf00cc9fdfec3381c2285cc1e616bf56453472. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/COF019401321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a6d44234a90875ceb4a9aa09ebc8ca39e0939c67895b81ce5396f6de59294c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/COF019401308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8aecd8e77852d0f5ce490d3fd4191e0d3b44f11a3f7d7b918d6f70e0b06d8ad. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/COF019401306.
Guillermo Buitrago - 16 Éxitos de Navidad y Año Nuevo
Clásicas de Todas las Navidades (Vol. 5)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03c1d7bc98587233bf1ebfd7ec0d228be01e9d1fd442b0271d5bb34377bbf93. 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/COF019401564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca58a0482662b115189f9b14835631450ba290739306375857a4cbe8d6cdcded. 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/COF019401311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca58a0482662b115189f9b14835631450ba290739306375857a4cbe8d6cdcded. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/COF019401311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe262785435bde0a80e47f84edb74d2997b82673ca3a7b0153fced90e096b4eaa. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/COF019401298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf88e142c3f53ee645c90b9ac6c1901644482389d59ed733471b40c0c7185d86. 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/COF019401302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6740309ead034d3f53840e5c66b6c9a9b029a098ee5baface4e5d95b4ac07f8. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/COF019804857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903a75893f9fd08e321d17f3ec771030749d4d8bfc1b7f3a9b29d5cc873ecf1d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/COF019401295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebf252517a89abe4af6dd2340398dec0fd483ec5124affaf0e2d970ee3f4245. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/COF019400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe262785435bde0a80e47f84edb74d2997b82673ca3a7b0153fced90e096b4eaa. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/COF019401298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3886375c18936e0fc1b726d4892396765311f2db6537b4c115dee158b61a4bbe. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COF019401296.
Antología Musical de Guillermo Buitrago, Éxitos Originales
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f69070c1b80e984cf8ae802a5876ead76a4290ef5ade70ae5551558f057f1b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/COF019401312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c6add0bfa561fcdab4101b686dbd8d8d0a454df6f3f24ffb1f70c8bc1aaa56. 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/COF019401292.